6.5 TD Highway Mileage Poll by GMC Hauler [Archive]

GMC Hauler

04-02-2006, 17:07

Ok. I finally got the information together, and here it is. Please respond in number to each question. If you have any notes or deviations from the included options that you believe are signifigant, please make a note. If you want to ask questions before posting, send me a PM.

1. What model do you drive Truck Shortbed, Truck Extended Cab, Suburban, Tahoe, Other (Specify):
2. Level 1500, 2500, 3500, 3500 dual rear wheels:
3. 4x4 or 2x4:
4. Driving Habits; 1 to 5 with 1 being conserative and 5 being a lead foot:
5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor:
6. Fuel additive added every fillup in OZ; number or none:
7. Size of fuel tank (Suburban is 42 gal):
8. Rear Gear Size (3.23, 3.55, 4.10, ect):
9. Tire Size (ex; 245/75 R16):
10. Tread style; Offroad, Mud/Snow, Highway:
11. Gear vendor? (if so, od/ud ratio and how you use it):
12. Boost control; Mechanical/Electrical:
13. Boost pressure setting (4-20lbs):
14. Manual/Automatic Trans:
15. Thermostat (160, 180, 190, 195, 205, 215, none):
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers):
17. Timing Gear Y/N:
18. Intercoooled Y/N:
19. Mist injection Y/N:
20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter):
21. EGR/Non EGR:
22. GM Turbo Style (GM5,6,8, other):
23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other)
24. TDC offset set to (stock, or the value you have it set to):
25. Stock injectors/High pop:
26. Synthetic oil Y/N:
27. Highway mileage (not towing, best averaged over 3 tanks):
28. When mileage data was obtained (Winter, Summer):
29. Approx miles on vehicle:

This is the items I could come up with that should affect mileage. I will store this data, and use graphs and a table to organize the data. If you have items on your rig that arent used in your calculation for mileage then make a note or don't include them (such as mist injection). I will report after we get enough data to start showing a trend.

16gaSxS

04-03-2006, 08:14

1. Short bed Extented cab
2. 2500
3. 2x4
4. 3
5. 3
6. PowerService 3-4 oz everytime
7. 26 gal. plus 38 gallon aux.
8. 3.42 gears
9. 245/75/16
10. mud/snow
11. no
12. Mech
13. up to 14 PSI
14. Auto Tranny
15. 195 degree
16. Heath 2.0
17. no
18. no
19. no
20. stock air boxx with AFE filter
21. EGR
22. GM 4
23. 3 inch madrel straight through muffler.....kitty ran away
24. TDC offset stock -0.5
25. Stock style
26. yes Rotella 5w-40
27. 19.7 @ 75, 20.6 @70, 21.4 @65
28. summer
29. 204,000 now owned since new,

moondoggie

04-03-2006, 09:40

[font=times]Good Day!

1995 Pickup

1. What model do you drive: Truck Extended Cab
2. Level: 2500 SRW
3. 4x4 or 2x4: 4x4
4. Driving Habits; 1 to 5 with 1 being conservative and 5 being a lead foot: 1
5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor: 5 (What

KenDavis

04-03-2006, 10:13

1- 94 Suburban
2- 2500
3- 4x4
4- 1
5- 3
6- none
7- 42
8- 4.10
9- 245/75/r16
10- mud/snow
11- none
12- mechanical
13- ??, stock
14- Auto trans
15- 190
16- stock
17- stock
18- none
19- none
20- AFE stage 2 intake system
21- EGR
22- stock
23- 4"
24- stock
25- stock
26- no
27- ??, purchased in Dec., so far 17.5 mixed driving
28- Winter
29- 200500 on vehicle, 16500 on new engine

Dvldog8793

04-04-2006, 04:49

1. What model do you drive- Crew cab long box
2. Level- 3500 single rears
3. 4x4
4. Driving Habits; 1 to 5- 4.5
5. Tune of vehicle; 1 to 5- 1.5
6. Fuel additive- Yes, mix of Powerservice, FPPF and two stroke
7. Size of fuel tank- 32
8. Rear Gear Size 4:10 locker Maghytech and sythetic
9. Tire Size 245-75 load E
10. Tread style; Mud/Snow
11. Gear vendor- Yes .78OD, runs in Autodrive all the time (on above 48mph)
12. Boost control; Mechanical NO VAC PUMP
13. Boost pressure setting- MAX is 15psi
14. Automatic Trans w/ maghytech and synthetic fluid
15. Thermostat- Stock
16. PCM programming Heath 2.0,
17. Timing Gear NO
18. Intercoooled Yes
19. Mist injection No
20. Air filter- UNI with air path opend as much as possible`
21. Non EGR:
22. GM8 Turbo
23. Exhaust- Wide open JK 3.5
24. TDC offset set to 1.945
25. High pop injectors
26. Synthetic oil Mobile Delvac
27. Highway mileage- Best observed 22MPG, realistic average- 18-19
28. When mileage data- Summer
29. Approx miles on vehicle: 170,000 (50,000 on new motor)

KallyI

04-04-2006, 07:26

1. What model do you drive Truck Shortbed, Truck Extended Cab, Suburban, Tahoe, Other (Specify):
2. Level 1500, 2500, 3500, 3500 dual rear wheels:
3. 4x4 or 2x4:
4. Driving Habits; 1 to 5 with 1 being conserative and 5 being a lead foot:
5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor:
6. Fuel additive added every fillup in OZ; number or none:
7. Size of fuel tank (Suburban is 42 gal):
8. Rear Gear Size (3.23, 3.55, 4.10, ect):
9. Tire Size (ex; 245/75 R16):
10. Tread style; Offroad, Mud/Snow, Highway:
11. Gear vendor? (if so, od/ud ratio and how you use it):
12. Boost control; Mechanical/Electrical:
13. Boost pressure setting (4-20lbs):
14. Manual/Automatic Trans:
15. Thermostat (160, 180, 190, 195, 205, 215, none):
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers):
17. Timing Gear Y/N:
18. Intercoooled Y/N:
19. Mist injection Y/N:
20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter):
21. EGR/Non EGR:
22. GM Turbo Style (GM5,6,8, other):
23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other)
24. TDC offset set to (stock, or the value you have it set to):
25. Stock injectors/High pop:
26. Synthetic oil Y/N:
27. Highway mileage (not towing, best averaged over 3 tanks):
28. When mileage data was obtained (Winter, Summer):
29. Approx miles on vehicle:

1. Extended Cab shortbed
2. 2500
3. 4X4
4. 3
5. 3
6. none
7. 25 gal
8. 3.73
9. 245/75 R16
10. Mud/Snow
11. no
12. Electrical
13. n/a
14. Automatic
15. Stock from new? Not sure what that is
16. Stock
17. N
18. Y
19. N
20. stock airbox with K&N filter
21. Non EGR
22. GM8
23. 3" crossover, 3" downpipe, 3" through Flowmaster Muffler, Cat removed.
24. stock
25. stock injectors
26. N
27. 18
28. Summer
29. 155350

Perry

04-04-2006, 15:40

1. 1999 Suburban
2. 2500
3. 4x4
4. Driving Habits: 2
5. Tune of vehicle: 1
6. Powerservice 8oz
7. 42 Gallons
8. 3.73
9. 265/75-16
10. BFG A/T
11. Gear vendor? No
12. Mechanical Turbo-Master
13. 15lbs max when towing up mountain passes
14. Auto trans
15. Factory Original t-stats
16. Heath 2.0
17. Timing Gear Y/N: No
18. Intercoooled Y/N: No
19. Mist injection Y/N: No
20. Stock airbox w/ AFE filter
21. Non EGR
22. Factory Original Turbo
23. 3" mandrel all the way, cat's still there for now.
24. TDC offset set to: -1.94
25. Factory Original injectors
26. Synthetic oil Y/N: No
27. Highway mileage @ 65-70mph (and speedo is accurate): 16mpg
28. When mileage data was obtained (Winter, Summer): Combined
29. Approx miles on vehicle: 66000

big61fourby

04-04-2006, 17:24

1. Model: truck extended cab
2. Level: 2500
3. 4x4
4. Driving habits: 3
5. Tune: 3
6. Fuel additive: power service, 16 oz
7. Tank size: 32 gal
8. Gears: 3.73
9. Tires: 265/75/R16
10. Tread style: all terrain??
11. Gear vendors: nope
12. Boost control: factory electrical
13. Boost pressure: 5 psi avg.
14. Auto tranny
15. Thermostats: factory (need to be replaced...)
16. PCM: factory
17. Timing gear: no
18. Intercooled: no
19. W/M inject: no
20. Air filter: stock
21. non EGR
22. Turbo: stock
23. Exhaust: 3.5", no cat
24. TDCO: stock
25. injectors: stock
26. Synthetic: no
27. Highway mileage: 16
28. When: winter (summer is similar)
29. Miles: 137k

redsuburban

04-06-2006, 11:00

1 - Suburban
2 - 1500
3 - 4X4
4 - 2
5 - 3
6 - 16oz PS Gray
7 - 42 gal
8 - 4.10
9 - LT245 75R16
10 - Highway
11 - NO
12 - Elec
13 - Fact
14 - Auto
15 - 180
16 - Fact
17 - NO
18 - NO
19 - NO
20 - K&N
21 - EGR
22 - Fact
23 - Stock
24 - Stock
25 - Stock
26 - YES 15-50 Mobil 1
27 - 17 mpg
28 - It's always summer here
29 - 265,000

HANK1948

04-16-2006, 06:48

1.CREW CAB LONG BED
2.3500
3.4x4
4.2 no more than 70 on hway
5.2
6.no
7.35 factory add on 30 gals in bed
8.4.10
9.235/85
10.mud/snow
11.no
12.mech
13.20 max
14.auto
15.195
16.factory (changing soon)
17.n
18.yes
19.n
20.K&N off turbo
21.non
22.GM5
23.3.5 downpipe 4.5 straight no muffler
24.not sure
25.stock
26.n
27.14
28.summer
29.165,000

ees

04-16-2006, 06:52

1. Suburban
2. 2500
3. 4x4
4. 4
5. 3
6. none
7. 42
8. 3.73
9. 245/75 R16
10. Highway
11. No
12. Mechanical - Heath
13. Approximately stock
14. auto (4L80E)
15. GM stock, not sure what temp - just what the dealer gave me
16. Stock
17. Stock
18. No Intercooler
19. No water injection
20. stock w/ airbox mods
21. Non EGR:
22. Stock turbo for '94 Suburban (don't know name)
23. Exhaust - Heath crossover pipe, the rest is stock
24. TDC offset - never checked since owning vehical
25. Stock injectors
26. dino oil
27. Highway mileage 15.5
28. When mileage data was obtained (Winter, Summer): every single tank
29. Approx miles on vehicle: 250k

_Scott

04-16-2006, 15:40

1. Model: Suburban
2. Level 1500
3. 4x4
4. Driving Habits: 3
5. Tune of vehicle; 2
6. Fuel additive added every fillup in OZ: none
7. Size of fuel tank (Suburban is 42 gal)
8. Rear Gear Size: 3.55.
9. Tire Size: 245/75 R16
10. Tread style: Highway
11. Gear vendor: none.
12. Boost control: stock
13. Boost pressure setting (4-20lbs): stock
14. Manual/Automatic Trans: Automatic
15. Thermostat (160, 180, 190, 195, 205, 215, none): stock
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers): none
17. Timing Gear Y/N: stock
18. Intercoooled Y/N: stock
19. Mist injection Y/N: stock
20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter): stock
21. EGR/Non EGR: stock
22. GM Turbo Style (GM5,6,8, other): stock
23. Exhaust: stock
24. TDC offset set to (stock, or the value you have it set to): stock
25. Stock injectors/High pop: stock
26. Synthetic oil Y/N: No -- DELO
27. Highway mileage (not towing, best averaged over 3 tanks): 19.5
28. When mileage data was obtained: Summer
29. Approx miles on vehicle: 60000 (only used on weekends/trips)

_Scott

DaveNY

04-20-2006, 17:38

1 Suburban
2 2500
3 4x4
4 2
5 2
6 Stanadyne blue + 1QT clean engine oil
7 42
8 4:10
9 265x75x16
10 Hwy
11 -
12 Mech. TM
13 9
14 Auto
15 195'
16 stock
17 no
18 no
19 no
20 stock
21 non- EGR
22 stock
23 stock
24 -1.94
25 stock orig.
26 no
27 17
28 Spring
29 117,000

GMC Hauler

04-20-2006, 18:00

1. What model do you drive: Suburban
2. Level :2500
3. 4x4 or 2x4: 4x4
4. Driving Habits; 1 to 5 with 1 being conserative and 5 being a lead foot:3
5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor: 2
6. Fuel additive added every fillup in OZ; number or none:16
7. Size of fuel tank (Suburban is 42 gal):42
8. Rear Gear Size (3.23, 3.55, 4.10, ect):4:10
9. Tire Size (ex; 245/75 R16):235/85 R16E
10. Tread style; Offroad, Mud/Snow, Highway:highway
11. Gear vendor? (if so, od/ud ratio and how you use it):no
12. Boost control; Mechanical/Electrical:mechanical
13. Boost pressure setting (4-20lbs):12
14. Manual/Automatic Trans:auto
15. Thermostat (160, 180, 190, 195, 205, 215, none):195
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers):Heath 2.0
17. Timing Gear Y/N:n
18. Intercoooled Y/N:n but i need one bad.
19. Mist injection Y/N:n
20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter):stock with airbox mods, unifilter
21. EGR/Non EGR:non egr
22. GM Turbo Style (GM5,6,8, other):5
23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other):4", no kitty
24. TDC offset set to (stock, or the value you have it set to):-1.47
25. Stock injectors/High pop:stock
26. Synthetic oil Y/N:next oil change goes in the Amsoil
27. Highway mileage (not towing, best averaged over 3 tanks):15.207
28. When mileage data was obtained (Winter, Summer): summer
29. Approx miles on vehicle:124K

Once i reach 20 responses, i'll put out some data.

Thanks for taking the time to asnwer:D

04-26-2006, 10:49

1. Truck Extended Cab Long Bed
2. 3500 dual rear wheels
3. 4x4
4. Driving Habits; 1
5. Tune of vehicle; 3
6. Amsoil Cetane boost (5 - 6 oz)or fuel modifier (16 oz) every other or every three tanks
7. Size of fuel tank (Suburban is 42 gal): 30 - 32 ?
8. Rear Gear Size (3.23, 3.55, 4.10, ect): 4.10
9. Tire Size (ex; 245/75 R16): 235/85/R16
10. Tread style; Offroad, Mud/Snow, Highway: All terrian Radials
11. Gear vendor? (if so, od/ud ratio and how you use it):NONE
12. Boost control: Mechanical
13. Boost pressure setting (4-20lbs): 12 - 14 max
14. Manual/Automatic Trans: 5 speed manual
15. Thermostat (160, 180, 190, 195, 205, 215, none): 180
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers):NONE
17. Timing Gear Y/N:N
18. Intercoooled Y/N:N
19. Mist injection Y/N:N
20. Air filter: stock 97 and newer box
21. EGR/Non EGR: NON
22. GM Turbo Style (GM5,6,8, other): GM3
23. Exhaust : 3.5" to 4" w/ Donaldson Muffler, no cat
24. TDC offset set to (stock, or the value you have it set to):-
25. Stock injectors/High pop: Marine
26. Synthetic oil Y/N: Y - Amsoil 15-40
27. Highway mileage (not towing, best averaged over 3 tanks): avg. 19.5
28. When mileage data was obtained (Winter, Summer): Summer
29. Approx miles on vehicle:252k on truck, 10k on engine

Truckie117

05-17-2006, 14:52

1. What model do you drive Suburban
2. Level 2500
3. 4x4
4. Driving Habits; 3
5. Tune of vehicle; 3
6. Fuel additive added every fillup in OZ; none:
7. Size of fuel tank (Suburban is 42 gal):
8. Rear Gear Size 3.23
9. Tire Size (ex; 245/75 R16):
10. Tread style; Highway:
11. Gear vendor? no
12. Boost control;Stock
13. Boost pressure setting Stock
14. Automatic Trans:
15. Thermostat 180
16. PCM programming none
17. Timing Gear N:
18. Intercoooled N:
19. Mist injection N:
20. Air filter stock
21. EGR
22. GM Turbo Style (GM5,6,8, other):
23. Exhaust Stock
24. TDC offset set to stock
25. Stock injectors
26. Synthetic oil N:
27. Highway mileage 17
28. When mileage data was obtained Spring
29. Approx miles on vehicle:115,000
30.

PLUMMER

05-19-2006, 07:01

1. What model do you drive Truck Shortbed, Truck Extended Cab, Suburban, Tahoe, Other (Specify): 2001 GMC SAVANA WORK VAN w/ weatherguard shelving and stocked full of plumbing supplies approx. everyday weight 8900lbs
2. Level 1500, 2500, 3500, 3500 dual rear wheels: 3500
3. 4x4 or 2x4: 2x4
4. Driving Habits; 1 to 5 with 1 being conserative and 5 being a lead foot:5
5. Tune of vehicle; 1 to 5 with 1 being perfect, 3 being average, and 5 as poor:3
6. Fuel additive added every fillup in OZ; number or none: Lucas 4oz./or none No measurable difference
7. Size of fuel tank (Suburban is 42 gal):28.5
8. Rear Gear Size (3.23, 3.55, 4.10, ect):3.73 limited slip
9. Tire Size (ex; 245/75 R16): 245/75 R16
10. Tread style; Offroad, Mud/Snow, Highway: Highway
11. Gear vendor? (if so, od/ud ratio and how you use it): None
12. Boost control; Mechanical/Electrical: Factory
13. Boost pressure setting (4-20lbs): factory
14. Manual/Automatic Trans: Auto
15. Thermostat (160, 180, 190, 195, 205, 215, none): factory, temp guage always reads 155 and 170 when hills or towing in hot climate
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers): Factory
17. Timing Gear Y/N: STOCK
18. Intercoooled Y/N: STOCK
19. Mist injection Y/N: STOCK
20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter): STOCK AIRBOX ,WITH AMSOIL FILTER, big improvement on turbo lag and eliminated any of the very little black smoke
21. EGR/Non EGR: 2001 STOCK
22. GM Turbo Style (GM5,6,8, other): 2001 STOCK
23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other) STOCK
24. TDC offset set to (stock, or the value you have it set to):STOCK
25. Stock injectors/High pop: STOCK
26. Synthetic oil Y/N: YES, AMSOIL 5w-40 diesel Series 3000, eliminated the need for block heater, starting was just a tap away
27. Highway mileage (not towing, best averaged over 3 tanks): 15.8 stocked (70 or 80 mph)and 17.2 completely empty@80mph and 19.1 @ 70mph
28. When mileage data was obtained (Winter, Summer): Summer/ Winter is exactly .5-.7mpg less in all above conditions
29. Approx miles on vehicle:156K

Sorry for the incomplete info but the van has never been wrenched on and I don't know the factory info. Are those above posted add-ons really helping MPG that much ? Are there add-ons I SHOULD be doing that will make big improvements, most of what I researched seemed to be a trade off for improvement. Wether it was worth working on and cost VS. the measurable improvement. You know these vans are tighter than you know what to wrench on. Thanks for the poll. If anyone can shed some light, just PM me , I don't wanna hijack this thread. Thanks

john8662

06-15-2006, 08:04

Did I miss something, but what is or when are we going to see some results?

GMC Hauler

06-16-2006, 10:25

Did I miss something, but what is or when are we going to see some results? You havent. I was hoping to get 20 responses before I put something out. I have most of the data computed. I'll give it another week. If I cant get the desired responses, i'll put out some info.

In the meanwhile, everyone that hasn't posted, please post.

fastcat800

06-21-2006, 09:29

--------------------------------------------------------------------------------

1. What model do you drive Truck Shortbed, Truck Extended Cab, Suburban, Tahoe, Other (Specify): 1994 pickup shortbed extended cab empty load
2. Level 1500
3. 4x4
4. Driving Habits; 2
5. Tune of vehicle; 3
6. Fuel additive added every fillup in OZ; PS 4 oz's
7. Size of fuel tank 25 Gal.
8. Rear Gear Size (3.23, 3.55, 4.10, ect):3.73
9. Tire Size (ex; 245/75 R16): 245/75 R16
10. Tread style; Mud/Snow
11. Gear vendor? (if so, od/ud ratio and how you use it): None
12. Boost control; Mechanical/Electrical: Factory
13. Boost pressure setting (4-20lbs): factory
14. Manual/Automatic Trans: Auto
15. Thermostat (160, 180, 190, 195, 205, 215, none): 195
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers): Factory
17. Timing Gear Y/N: STOCK
18. Intercoooled Y/N: STOCK
19. Mist injection Y/N: STOCK
20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter): STOCK AIRBOX with hole cut in the top of the box.
21. EGR/Non EGR: Non EGR 1 ton intake manifold
22. GM Turbo Style (GM5,6,8, other): 1994 STOCK
23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other) STOCK
24. TDC offset set to (stock, or the value you have it set to):STOCK? don't know, rattles really loud at idle
25. Stock injectors/High pop: STOCK
26. Synthetic oil Y/N: YES, Rotella 5W-40
27. Highway mileage (not towing, best averaged over 3 tanks): 19.5MPG @ 75MPH, 21.2MPG @ 65MPH, 16.5MPG average city
28. When mileage data was obtained (Winter, Summer): Summer/ Winter is aprox. 2MPG less in all above conditions
29. Approx miles on vehicle:200K

john8662

06-21-2006, 13:32

mite as well contribute rite?

1. Suburban:
2. 2500
3. 4x4
4. 2
5. 2
6. none
7. 42 gal
8. 4.10
9. 245/75 R16
10. Highway
11. No
12. factory
13. factory 9psi observed.
14. Automatic Trans
15. 180 Dual
16. Stock F
17. No
18. No
19. No
20. 97 a/b Purolator Paper
21. Vin F, non-egr
22. GM-4
23. 4"
24. stock - .7
25. stock pop injectors
26. No, Delo 15w40
27. 16 mpg
28. Winter
29. 100k

ogrice

06-27-2006, 13:46

Please post your results and how you came about to calculate everything. Here is my rig's info.

1- pickup, regular cab, long bed
2- 3500 dual rear wheel
3- 2x4
4- 2
5- 1
6- 12 oz of diesel kleen or lucas oil
7- 36 gallons
8- 3.73
9- 235/85 R16
10- Highway
11- not installed
12- mechanical boost control
13- 0-10lbs. 12lbs max
14- manual trans nv4500
15- 195 degrees
16- no pcm. DB2 pump
17- yes
18- no, in the works though
19- no
20- K&N round element
21- non EGR
22- GM-3
23- BD 4"
24- stock I guess. don't know with DB2 pump
25- hi pop.
26- no
27- 20.8 highest avg.
28- summer
29- truck has 234k. engine has 34k.

I use propane on the highway. MPG figures are with propane use.

GMC Hauler

06-30-2006, 13:04

I have finished putting together the data. I had to fit the data as best as possible. I assumed 195 is the stock
thermostat setting (if it is different, please advise). Also, Ogrice, I did not use yours becasue of the propane use,
it would introduce too many variables.

http://pic14.picturetrail.com/VOL514/3320954/7024686/162046734.jpg

http://pic14.picturetrail.com/VOL514/3320954/7024686/162046732.jpg

As you can see, i had to break it up into 2 sections, because it was too long.
This is sorted top to bottom from highest mileage to lowest. Most of the lower gear ratios (3.23) were concetrated near the top.
The 4.10's were sprinkled throughout, which was surprising.

The other trend I noticed is that the higher mileagers were electronic boost control, where the lower mileagers were dominated by mechanical.
I have been thinking of switching back to electronic boost control for this reason, although I don't want to use the factory vacuum pump.

moondoggie

06-30-2006, 14:40

GMC Hauler

06-30-2006, 15:38

Good Day!

Any chance of getting this in spreadsheet form? If so, you could private message me your real email address, & I'd give you my real email address, to which you could attach this spreadsheet to an email.

Looks like that moondoggie feller is near the top. Did he tell you he's a pathological liar?

Blessings!

(signature in previous post)

You've got mail.

Everyone can get it in spreadsheet form if they wish, just PM me your email address.

I can continue to add data. I'll do it in batches of 5 as it is entered.

The next update I make wil have an overall gear ratio instead of the tire size and rear end ratio.
Alot more accurate that way.

jmp1945

09-02-2006, 08:04

1. 1999 Suburban
2. 2500
3. 4x4
4. 1
5. 3
6. 12
7. 42
8. 3.79
9. 235/85R16
10. M/S
11. no
12. stock
13. stock
14. Automatic
15. 195 (180 is stock)
16. BD
17. no
18. no
19. no
20. stock airbox, Amsoil filter
21. Non EGR:
22. stock (GM8?)
23. 4", no kitty
24. stock
25. stock
26. Delo 400 (quasi-synthetic)
27. 18.7
28. summer
29. 138000

rustyk

09-26-2006, 21:26

Everybody's got something so, so, NORMAL...:D

1. '94 Barth ["What the HELL is that?"] 28' Breakaway Class A motorhome
2. 8500? (I dunno, it has a GVW of 18K lbs.)
3. 4x6
4. 1 (As if there's anything else as an option)
5. 1
6. Injector cleaner and/or ATF only
7. 40
8. Dana 80 4.53 (I think - Mag-Hytec cover installed)
9. 8x19.5
10. Mixed
11. Gear vendor? Nope - no room and unnecessary
12. Boost control: Purely Stock
13. Same as 12.
14. Automatic Trans 4L80E (Mag-HyTec pan installed)
15. Thermostat: 2x195F (Kennedy Diesel kit installed)
16. N/A - DB-2
17. Timing Gear: N
18. Intercooled: N
19. Mist injection: N/A
N20. Air filter: Stock Wix, but this diesel pusher has far less restrictions - "Snorkle" is 4"
21. Non-EGR
22. GM Turbo Style: 5
23. Exhaust: 4" Turbo to ground
24. TDC offset set to : Stock
25. Stock injectors
26. Synthetic oil: N Total waste of money (I'm a former fuels and lube engineer)
27. Highway mileage: 9.8 mpg
28. When mileage data was obtained: Summer
29. Approx miles on vehicle: 52,500

V8 Power

11-13-2006, 13:33

1. Truck long bed extended cab
2. 2500
3. 4x4
4. 3
5. 4
6. none
7. 34 gal
8. 4.10
9. 245/75/16
10. Mud/Snow
11. no
12. factory
13. factory (I think 9 psi)
14. manual
15. none
16. stock
17. stock
18. no
19. no
20. Factory
21. non
22. stock
23. 4"
24. stock
25. stock
26. no
27. 16
28. summer
29. 243000 (43000 after overhaul)

11-30-2006, 19:59

1. What model: 1993 Chevrolet Silverado long bed, extra cab.
2. Level 2500HD (eight lug hubs)
3. 2x4:
4. Driving Habits; 2
5. Tune of vehicle; 3
6. Fuel additive added every fillup in OZ; 6oz Stanadyne or Howes + 2cycle oil
7. Size of fuel tank: 34gallon
8. Rear Gear Size: 3.42
9. Tire Size:245/75 R16
10. Tread style; Mud/Snow
11. Gear vendor?: No
12. Boost control; Mechanical-Heath
13. Boost pressure setting: 11psi
14. Manual/Automatic Trans: Manual, 5spd
15. Thermostat: 180*F
16. PCM programming: No computer!
17. Timing Gear Y/N: DSG geardrive
18. Intercoooled Y/N: No
19. Mist injection Y/N: No
20. Air filter: SS Diesel Supply K&N style
21. EGR/Non EGR: No EGR
22. GM Turbo Style: GM-8
23. Exhaust: BD 4" with 3" downpipe
24. TDC offset set to: NA
25. Stock injectors/High pop: Stock
26. Synthetic oil Y/N: Yes
27. Highway mileage (not towing, best averaged over 3 tanks): 19.2mpg
28. When mileage data was obtained (Winter, Summer): Summer
29. Approx miles on vehicle: 241,000

RT

HiwayDiesel

12-03-2006, 13:36

1. 310 Cab/Chassis (135.5" Chassis) with TYMCO Sweepers 96-98-99-00
2. 3500 DRW
3. 2x4
4. Employees (4.5)
5. Runs (3)
6. Nada
7. 20?
8. 410
9. 235/85-16
10. M/S
11. None
12.Stock
13.4
14. Auto 4L-80E
15. 195
16. N0
17. N0
18. N0
19. N0
20. Stock
21. EGR
22. Stock
23. Stock
24. Stock
25. Stock
26. No, Rotella
27. Only have fleet avg mileage: 8.67
28. Last fleet report (Oct 06)
29. Approx miles on vehicle: 245,000, 230,000, 195,000, 183,000

These trucks get the worst abuse you can dish out. Low speed parking lots, then high speed runs. Operators understand: start, drive, stop. The whole "how diesels work" escapes them. Repairing a broken frame today....weeee....

ace58

12-16-2006, 18:28

I had to post results. It works. I have never driven consistent enough to record numbers any better than 17 MPG but today I went on a 278.2 mile ride on 13 gallons of fuel and got 21.4 MPG. Stayed at 1800 RPM which is 65 MPH with 3:42 rear gear.

1. 1999 Suburban LT
2. 1500
3. 4X4
4. 1 on this ride
5. tune is #1
6. Kennedy mix of cetane and lubricity
7. 42 gallon
8. 3:42
9. 245/75/16
10. mud/snow
11. none
12. Peninsular non waste-gate
13. "
14. automatic
15. 195
16. Heath Computer
17. timing chain set
18. Kennedy Intercooler
19. no mist
20. Kennedy Air Box
21. no EGR
22. Peninsular non waste-gate
23. Kennedy 3.5 system, coated cross over and coated manifolds
24. -1.94
25. high pop
26. Amsoil 15/40
27. 21.4
28. 164K truck 2500 Peninsular 18.1 engine

d.h.

12-29-2006, 18:11

1. c/c l/b
2. 3500 dually
3. 4x4
4. 4
5. 1.5
6. Shaffers one capfull every fill
7. 35 Gall
8. 4:10
9. 225/75 16
10. Highway
11. No
12. Boost fooler (elec)
13. 15lbs(pulling)
14. Automatic
17. No
18. Yes
19. No
20. Aftermarket
21. egr
22. GM-8
23. 4"straight
24. Stock
25. High pop
26. Yes
27. 18 empty
28. summer
29. 200,000 km

ECMProgrammer

01-08-2007, 00:33

1. Truck Extended Cab SWB
2. 2500
3. 4x4
4. 3-4
5. 1
6. none
7. Stock
8. 4.10
9. 265/75R16
10. Mud/Snow, Highway:
12.None
13. 6-7 cruise, 18 WOT
14. Automatic Trans:
15. Stock
16. Westers
17. Stock
18. Stock
19. N
20. Stock
21. Non EGR:
22. Stock
23. mufff removed, kitty removed, 3"
24. -1.24
25. Stock injectors
26. Castrol 5W50 Synthetic
27. 24-26
28. Summer
29. 378,000 kms

Lyndon
www.ecmprogrammer.com
Westers Garage

'98 6.5TD VIN "F", '01 C5 Convertible, '04 LLY, '05 SSR, '05 Yukon

Slim shady

01-14-2007, 07:09

1. Long bed extended cab
2. 2500, Single
3. 4x4
4. 3
5. 1
6. Bio diesel pump gas,
7. 36
8. 4.10
9. 235 85 R16
10. Mud/Snow,
11. N/A
12. Custom Electrical:
13. 15 psi
14. Manual
15. 195 winter, 180 summer, large diameter dual setup, 130 GPM pump
16. N/A
17. N:
18. Y: custom made
19. N
20. Stock mod, KN filter
21.Non EGR:
22. GM-8
23. 4

GMC Hauler

01-14-2007, 21:02

http://pic14.picturetrail.com/VOL514/3320954/7024686/222288141.jpg

http://pic14.picturetrail.com/VOL514/3320954/7024686/222288131.jpg

Updated.

We'll see how I move up... Installed new injectors and KD glow plugs a few weeks ago.

d.h., could you provided the missing information?

gherrell

01-15-2007, 08:16

BE CAREFUL!!!

I think that ECM programmer is quoting "Canadian MPG", which uses a different sized gallon that we us in the US (4.456L CA gallone versus the 3.785L "US gallon"). APPLES TO ORANGES comparison with his results. His results should read "20.4 to 21.1 US MPG" to be apples to apples, which is still great fuel economy but much more realistic than 25MPG!!!!

Please also note that he quotes the odometer reading in "kms", which is an additional clue...

GMC Hauler

01-16-2007, 15:50

ECMProgrammer

01-16-2007, 16:24

gherrell

01-17-2007, 08:44

Actually it's 1.201 of the US Gallon. 20.8 US MPG.
kms to miles is 1.62 ratio
I could confuse you further with litres consumed per 100kms....

Lyndon
www.ecmprogrammer.com
Westers Garage.

Well, your original post specified a RANGE of 24 to 26 MPG (Imp). Which, if converted to US gallons, would be 19.98 to 21.64 MPG (US). And trust me, you would not confuse ME with L/100km's. If you really wanted to confuse people, then give your fuel economy in furlongs/firkin (*0.88888889)

GMC-RKL

03-06-2007, 22:19

1. 93 GMC 6.5 Turbo Diesel, extend cab, long bed pickup.
2. Sierra 2500HD
3. 2x4
4. 2
5. 2
6. No
7. 42 gal.
8. ?
9. 235/85 R16 10 ply Cooper Discovery.
10. Mud and Snow.
11. ?
12. ?
13. ?
14. 5 speed manual transmission.
15. ?
16. ?
17. ?
18. ?
19. ?
20. Stock
21. ?
22. ?
23. 3" straight pipe.
24. ?
25. ?
26. Natural oil, Shell Rotella.
27. 22 m/gal.
28. Fall/Winter.
29. 70K.

rustyk

03-15-2007, 21:33

Since I've repowered StaRV II with a new AMG engine, things have changed, so I'm revising. Old numbers in italics:

Everybody's got something so, so, NORMAL...

1. '94 Barth ["What the HELL is that?"] 28' Breakaway Class A motorhome
2. 8500? (I dunno, it has a GVW of 18K lbs.)
3. 4x6
4. 1 (As if there's anything else as an option)
5. 1
6. Injector cleaner and lubricity additive for USLD
7. 40
8. Dana 80 4.53 (I think - Mag-Hytec cover installed)
9. 8x19.5
10. Mixed
11. Gear vendor? Nope - no room and unnecessary
12. Boost control: Non-wastegated turbo - 12 psig max (Purely Stock)
13. Same as 12.
14. Automatic Trans 4L80E (Mag-HyTec pan installed)
15. Thermostat: 2x180F stock with new mill (Kennedy Diesel kit installed)
16. N/A - DB-2
17. Timing Gear: Phazer (N)
18. Intercooled: N
19. Mist injection: N/A
20. Air filter: Stock Wix, but this diesel pusher has far less restrictions - "Snorkle" is 4"
21. Non-EGR
22. GM Turbo Style: Peninsular Diesel Supplied
23. Exhaust: 4" Turbo to ground
24. TDC offset set to : Stock
25. Hi-Pop Injectors (Stock injectors)
26. Synthetic oil: N Total waste of money (I'm a former fuels and lube engineer)
27. Highway mileage: 11.0+ mpg (9.8 mpg)
28. When mileage data was obtained: Winter (Summer)
29. Approx miles on vehicle: 56,400 (52,500)

AndyL

03-20-2008, 07:45

1. 1980 Olds Cutlass
2. 1/8 Ton
3. RWD
4. Driving Habits; 2
5. Tune of vehicle; 3
6. Fuel additive added every fillup in OZ; 2-Cycle Oil
7. Size of fuel tank (Suburban is 42 gal): 18 Gallons
8. Rear Gear Size (3.23, 3.55, 4.10, ect): 3.30
9. Tire Size (ex; 245/75 R16): 255/60R15
10. Tread style; Offroad, Mud/Snow, Highway: Highway
11. Gear vendor? (if so, od/ud ratio and how you use it): None
12. Boost control; Mechanical/Electrical: NA
13. Boost pressure setting (4-20lbs):
14. Manual/Automatic Trans: 700R4
15. Thermostat (160, 180, 190, 195, 205, 215, none): 180
16. PCM programming (Heath 1.0, 2.0, Kennedy 72/76/max, Westers): Kennedy DB2
17. Timing Gear Y/N:
18. Intercoooled Y/N:
19. Mist injection Y/N:
20. Air filter (stock, stock w/ airbox mods, stock airbox with special filter, both, 97 and newer box, cone filter): Factory
21. EGR/Non EGR: EGR Blocked
22. GM Turbo Style (GM5,6,8, other):
23. Exhaust (Stock, mufff removed, kitty removed, 3", 3.5", 4", other) Dual 2.25" straight pipes
24. TDC offset set to (stock, or the value you have it set to): By ear
25. Stock injectors/High pop: New stock
26. Synthetic oil Y/N: 5w-40 Rotella
27. Highway mileage (not towing, best averaged over 3 tanks): 30.1 Best, 27-29 Average
28. When mileage data was obtained (Winter, Summer):
29. Approx miles on vehicle: A zillion! Needs timing chain BAD!

Truckie117

04-25-2008, 18:51