6.5TD MPG Hiway mileage Poll!

[16gaSxS]

Can you include the rear gear size... That affects everything

GMC; It's true but also driving habits, truck size, 4x4 vs 4x2, tire size, tire inflation, & maintaince all effect your MPG. I'm open to idea's we can set up to 10 questions on a poll. How would a gearing & MPG poll be set up? Any ideas?

[GMC Hauler]

GMC; It's true but also driving habits, truck size, 4x4 vs 4x2, tire size, tire inflation, & maintaince all effect your MPG. I'm open to idea's we can set up to 10 questions on a poll. How would a gearing & MPG poll be set up? Any ideas?

We'll you hit many, but let's see:

1. SB Reg Cab truck, SB X cab truck, LB Reg CaB truck, LB X Cab Truck, Suburban, Tahoe, other
2. 1500 4x2, 1500 4x4, 2500 4x2, 2500 4x4, 3500 4x2, 3500 4x4, 3500 duals 4x2, 3500 duals 4x4(do all 3500's have duals? if so, delete that portion of the question)
3. Fuel Additive no or then selections which basically find out how many oz additive per gal of diesel (1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5
)
4. Condition of vehicle: Excellent, Very Good, Good, Fair, Poor
5. Driving habits: Conservative, moderate, Lead foot (and add city/highway to each one of these)
6. Thermostat 160, 180, 190, 195, 200, 205, 210, 215, none
7. Overall rear gearing (rear end gear calculated with tire size to give an effective rear gear) (Gear Vendor guys must calculate this into account to compensate for the gear they are usually in)
8. Stock Air Filter/Replacement upgrade air filter/Cone Air filter
9. Intercooler Large/Intercooler Small/None
10. Mechanical Boost control boost Level 6,8,10,11,12,13,14,15,16,17,18/ ECM Boost Control
11. Kennedy PCM (a option for each level he has), Heath PCM 1.0, 2.0, Westers (and any others I may have forgotten)
12. Exhaust stock/stock kitty removed/stock muffler removed/stock both removed/3.0", 3.5", 4.0", 5.0" (is anyone offering 5"?)

You could probably get rid of question 4, asuming everyone's vehicle is average, or make an individual poll for excellent, very goog, good, fair, and poll (or just make 2 or 3)

I know that still makes 11 left, but it's tough to get rid of any of those...

How many options can each question have for an answer?

[16gaSxS]

GMC;
You can only select one of upto ten questions? so you put the critria in and then you have MPG's. If you have 4 MPG scales for each 10 configuration that would be 40 selections very unwieldly. I think for those of us who have been around awhile we understand that a 4.10 dually K/3500 Crew Cab about 15-16 mpg on Highway is about average. Someone like me who has a C-2500 or C-1500 with 3.42's will get around 19-20 no problem.

[GMC Hauler]

Guess i forgot the most important piece, the actual MPG.

Still, i didn't see it in the answer...How many answers can each question have?

[GMC Hauler]

GMC;
You can only select one of upto ten questions? so you put the critria in and then you have MPG's. If you have 4 MPG scales for each 10 configuration that would be 40 selections very unwieldly. I think for those of us who have been around awhile we understand that a 4.10 dually K/3500 Crew Cab about 15-16 mpg on Highway is about average. Someone like me who has a C-2500 or C-1500 with 3.42's will get around 19-20 no problem.

It can be, but if you represent it in a list format like a spreadsheet that has the vehicles listed in ascending order of MPG, and let the options be listed next to the mpg, It will show the trends in the data.

I know it would be a daunting task, but if there is enough interest, I would be willing to collect the data and represent it in graphs, ect

[Artworks]

of course my mileage is in canadaian gals. ( 4.56 Liters vs, 4 Liters per ) but not whole lot difrence. my truck is basic not modified (yet ) with AMG engine (30,000 Kl) got 19.5 with 4 x engaged on 585 kl trip 70 kl were in city driving and 20 min. at idle in a snow filled ditch (DUH)! Get 18mpg pulling 18 ft. car trailer with '78 belair on it. So figure with a few mods 21 plus. whish me luck

[CareyWeber]

I voted 18 mpg, but there is a condition to get 18 mpg. I have to limit my speed to no faster than 65 mph. If I go over 65 mph my best is in the 16 - 17 range, and if I hit 75 mph it goes lowerrrrrrrr.

I base my MPG # on repeatable numbers that I have obtained lots of times not a one time think that might have a foaming factor adding or subtracting from the actual MPG #.

Carey

[Cowracer]

GMC Hauler made a much more definative MPG post, so I am closing this post.

Tim

[16gaSxS]

GMC Hauler made a much more definative MPG post, so I am closing this post.

Tim

I thought about this Poll and reopened it as the DuraBux MPG Poll has been around and opened so that folks can add their results to improve the amount of info. This is a much more basic and quick Poll to respond too.

[4348rd]

surburban with the 6.5 around 23
wrecker with 6.5 around 16 mpg ,5 speed with 4.10 gears
rollback with 6.5 around 11 mpg ,5 speed and 4.41 gears

[Truckie117]

Were sorry to hear that you are in canada vote to become the 52nd state JK.

[16gaSxS]

Were sorry to hear that you are in canada vote to become the 52nd state JK.

This one has me perplexed?
But I am confuse easlie.

[rustyk]

Well, I get about 9.8 mpg, but then my 6.5L TD is in an 18,000 lb. class A motorhome.

[rustyk]

Well, I get about 9.8 mpg, but then my 6.5L TD is in an 18,000 lb. class A motorhome.

Things do change - with my replacement Peninsular Diesel AMG 230 HP (custom spec'ed) 6.5L TD, mileage is nearly 11 mpg...

[bcbigfoot]

I have a 93 2500 extended cab long box, 2 wheel drive, 4l80e trans, 3.42 gears non posi full floater rearend, tires are 265/75 16 ltx michelins, F engine, original pump and injectors with 170,000 miles. Its getting 20mpg on the US gal.

[xtrempickup]

I looked at this thread briefly, I have a couple questions. I'm running a stock 95 GMC Sierra 6.5L Turbo diesel ext cab 6ft bed automatic trans with 152K miles and my truck rides on 315/70/17 in tires with completely stock gears to my knowledge. Normally In town I get about 11-12 miles to the gallon and I have mainly stop and go and some highway, mostly on and off the brakes. I do a little better on the highway, but not a whole load, maybe 2 mpg better. What is the standard PSI that these truck's turbos push.? I don't know as I just found the wastegate actuator on mine is shot and was wired shut so it would boost. I have no Idea of the specs on these trucks. My truck the way it was would pull up to 13 psi normally on the highway depending on hills and normally driving anywheres from 5-11psi. If i stomped it I would pull well over 15Psi as the little boost gauge thats installed that is a 15psi gauge will go past and start going around again. I got a lot of questions, but need to start getting some answers for at least a baseline, maybe this thing is out of wack thats why my MPG sucks.

[GMC-RKL]

I have a 93 GMC 6.5 Turbo Diesel with a 5 speed manual transmission and I use the criuse control. This is an extended cab pick up approaching 70K miles.

This is my first diesel vehicle and I am learning the ropes and I really like driving this truck. I live in Montana and it makes going from point A to point B quite pleasant since these points can be very far apart.

On a recent trip to Minnesota in January, I average 24 mpg. I did have a tail wind that helped and I was traveling light. I normally average better than 20 mph.

I check my mileage at every fill up, so my mileage records have a good track history. I will see in better detail how things shape up when it warms up. So far winter weather has not slowed me down too much.

I enjoy this website and bulletin board. Keep up the good work; all the best.

GMC-RKL

[GMC-RKL]

I had original rubber on my truck when I received it. The tires quickly played out as I started driving it over Montana gravel roads.

I replaced the old tires with Cooper 235/85 R16 10 ply. They are taller tires. Over 100 measured miles the odometer is reading about 95 miles traveled. I would imagine I am rolling faster than my speedometer indicates as well. But in Montana the Interstate speed limit is 75 mph. I ususally do not go that fast.

So, if I could have an accurate measure of miles traveled I might be getting even better mileage than I calculate.

My truck runs like a dream at 1800 rpm in 5th gear going about 65 mph, and I fit comfortably in it to boot. Happy driving.

RKL

[acfloors]

I have a 2000 express 1 ton van with the 6.5L totally stock but for the K&N air filter. My best mileage to date was out west in nevada. I got just over 20 miles per gallon. I average 17 to 19 depending on if I run the cruise and keep it at or below 70mph.

[Robyn]

My 95 3500 DaHooooley crew cab 4x4 with 6.5 and 4.10 gears will run 18-19 at 60-65 running light

Robyn