2001-early 2004 LB7 Duramax Fuel Economy Poll

[More Power]

Fuel economy is one of the top 2-3 reasons why most people buy a diesel pickup.

What we want to do here is help determine what people are seeing for non-towing fuel economy in actual on-road use.

Let us know what your truck delivers.... This poll is for owners of the LB7 (2001-early 2004 model Duramax 6600 engines). We are assuming summer blend fuel.

You will need to vote before viewing the poll data. If you don't own an LB7, but would like to see the poll data, you'll need to first vote in the poll using the "Don't Own an LB7" selection for both the local driving and highway driving sections.

Round your fuel economy averages to the nearest whole number. For example a 16.4-mpg would be 16, a 16.8-mpg would be 17.

MP

[ 01-03-2005, 02:32 PM: Message edited by: More Power ]

[Kennedy]

I placed my numbers in the 15-16 off hwy, and 17-18 on hwy, but in reality, I run near 17 off hwy, and near 19 on hwy pretty consistently. I'm seldom down to 16 off hwy, and seldom in the low 18's hwy. Just did not feel that I quite made the next brackets...

[BobW]

More Power,
How about a second poll on mileage while towing. Might break it up into weight ranges.

[More Power]

Weight, wind drag and speed introduce a lot of variables when towing.... It'd be tough asking the right poll questions that would include all of the possibilities.

Open to suggestions.... :D

MP

[Pfouts1001]

MP, it might be good to run a 3 different polls for trailering, one for pulling gooseneck and tag open trailers (utility trailers, machinery trailers, and open car haulers), enclosed tag trailers (car haulers and rv trailers), and gooseneck/fifthweel enclosed trailers (Car haulers and rv trailers)... and then in each class break down into weight ranges ie.

gooseneck and tag open trailers
3K and under
3-6K
6-10K
10-14K
14K and up

Enclosed tag trailers
3K and under
3-6K
6-10K
10-14K
14K and up

Enclosed gooseneck/fifthweel trailers
7-10K
10-14K
14K and up

additionally, give the respondents an opt out for each weight category as you have done on this poll so that people may just view the post. This will allow people to respond to the weights which they most pull

just my 2 cents

[More Power]

What towing speeds?

MP

[BobW]

45-55 mph
55-65 mph
65-75 mph

[Halco]

I hope I see 19-20 MPG some day out of my truck. Be curious to know how many of the 19-20 range are stock and how many of those are 6 speeds.

[Todd Manning]

I just did an extended highway trip and purposely drove between 55-60mph the whole distance to check my mileage. Ended up getting 23 mpg (Imperial gallons), so this 19 mpg US (assuming my math is right).

2003 LB7 D/A with Magnaflow 4" exhaust and K&N air filter.

[Todd Manning]

I just did an extended highway trip and purposely drove between 55-60mph the whole distance to check my mileage. Ended up getting 23 mpg (Imperial gallons), so this 19 mpg US (assuming my math is right).

2003 LB7 D/A with Magnaflow 4" exhaust and K&N air filter.

[TMS]

Over the first 10,000 miles I could only get around 14-16. At about 10,000, everything seemed to run "free'er"....most recently a interstate trip back from Kansas in August running at 75+ returned 20-21 MPG !!! smile.gif

[More Power]

gooseneck and tag open trailers
3K and under
3-6K
6-10K
10-14K
14K and up

Enclosed tag trailers
3K and under
3-6K
6-10K
10-14K
14K and up

Enclosed gooseneck/fifthweel trailers
7-10K
10-14K
14K and up

45-55 mph
55-65 mph
65-75 mph

That's 39 polling questions, not counting the fuel economy range and "does not apply" selections for each weight/speed category. :(

MP

[precision37]

Total miles driven in 2004- 17,811
Total fuel used- 825.408 gallons
21.58 mpg average for the year. No complaints.
2002 GMC reg cab,4X4, ZF, stock. Very light towing and some snow plowing.

[Scott Glewwe]

I have noticed one thing not mentioned in the poll. In the summer months I typically get an average MPG (60% highway) of 17-18. However wintertime sees this drop considerably to the 14-15 MPG range. I assume this is due to the greater amount of "cold weather additive" used to keep diesel moving in the cold weather. Unfortunately for diesel owners here, Diesel is also at its highest price during the winter (competing with the fuel oil market). No big deal but my old 6.5L chevy never saw this big a drop summer to winter.

[precision37]

It's a combination of winter fuel and cold temps. The engine doesn't run a top efficiency until it gets up to opperating temp.
Cold weather slows this process down a lot. Sometimes if it is really cold, my truck never even gets over 180 degrees unless I'm on the highway for awhile. Don't forget about having to turn gears and driveline components in cold lube fluids.

[SoTxPollock]

Worst mileage recorded, 11.73mpg, gooseneck loaded GCVW=24,500.Best recorded 20.73.Running empty@ 68 mph.

Overall Average-49,005 miles, 2,736.93 Gallons=17.9 MPG. in 1101.1 hours=44.505 MPH lifetime average so far. I'm surprised it's that high. I did 453 offroad miles Hunting in Colorado, some it crawling through the canyons in 4 low. It ain't my old K3500 dully, but I sure like the fuel mileage better.

[Kirkes]

I would like to know how you can get over 17 mpg? I have never got more than 16.5 weather I baby it or not.

[Corwin]

17 to 20 most common

Check out results on this link below question (12), results of 61 people from 2001 to 2003 Chev/GMC owners

http://hobbycanada.qazam.com/Surv/Chev-GMC%202001%20to%202003.html

[c5dura]

I can't believe the excellent milage you guys are getting. I got 37k on my truck and have NEVER been able to go 400 miles on a tank. Therefore, I have never seen even 13mpg.

Dealer tells me that is perfectly normaly for a big truck like mine (see sig). Are there any other 3500 4x4 guys out there that have been able to break 400 miles on a tank full?

[Inspector]

I have a little over 17K on the clock now and solo average about 14.5 to 15. Never have seen much better than that on the average. I do have J/A installed so that may be skewing the numbers. Towing my heavy rig the milage will be between 9.5 and 11.5. I never drive over 70 with the fiver.
Denny

[ibelyea]

I have and 02 with "Edge" and never see more than 17.5 solo and 10-12 pulling my 5th wheel. I did go as low as 7.5 in North Dakota, but that was with a 40MPH head wind and 50 MPH. While I would like to get better mileage, I'm a little to heavy footed to really realize any better.

[birddriver]

At 75 on hwy, I am disapponted to see less than 22mpg at 60 I get 24mpg my city average is 17 with 28000 on the clock the only mod is a ventalated air box and a soft toneu cover

[More Power]

I filled up late yesterday. Fuel economy for this tank was 17.8 mpg - winter fuel in January. Pretty typical.....

MP

[moondoggie]

Good Day!

birddriver: Are you calculating your mpg from your odometer & the gallons you pump, or from an electronic readout in your cab? If you

[moondoggie]

Good Day!

birddriver: Please don't take this truck to your dealer, then get it back & tell us you now get 18 mpg - get it to someone who knows about these things & find out why you're doing so well, if that's possible. :D Then for those few of us where mpg is more important than snort, we can duplicate whatever you're doing or what's different about your truck. ;)

Blessings!

Brian Johnson, # 5044

[Ponch]

Last year (winter) I went on a 6000 mile trip towing my 28.5ft tag loaded at around 9000lb. I drove the northern route to Phoenix, flagstaff and down,then the southern route back to IL
Going out I averaged 70mph coming back was 60mph. This was hand figured at every stop as well as at the end.
Without towing and traveling I run 72 and will get 17.5-18 around town and normal driving I get 18-18.5

[DA_MAXX]

03 d/a, cc, 41K miles. Consistently average 18mpg. Haven't seen anything over 20+. I filler up to the top of the cap everytime and calculate the mileage manually. Daily driver, 38 miles one-way to work, 97% freeway, doing 70mph. No performance mods. Have had 1 injector replaced and 1 allison tranny replaced.

[Spartus]

22mpg Highway @ 80mph.
17.5mpg mixed driving.

14-16mpg towing 6,000lbs @ 75mph.

I tow with Attitude set at level 1. Stock exhaust, stock air box....

[Hottruck]

Hey all,
I've never gotten better than 14.5 mpg D/A and I'd like to know what I have to do to improve. I've got about 35,000 miles now..
Thanks for any input... :rolleyes:

[birddriver]

SORRY for the long delay in a reply.
A few times I have checked the mileage by hand.
mostly it is of the DIC. Fuel used is always within a 1/10th or so from what I refill to.
I always fill it to the brim so there is no guessing in that.
When I modified the air box I Removed three sides leaving the engine side,bottom and the four corners, also removed the foil patch from the inner finder. Then I smoothed the top and heavly blended the air tube transition and blocked off the little bulb "do-hicky" at the other end.
I use No additives or synthetic oil.
The best I can say is that the LORD has blessed me with a good truck!
Please note: My truck is TWO wheel drive.

[JJ-Dmax]

Birddriver, can you provide a little more info/detail regarding what you have done to your airbox. i.e., (I smoothed the top and heavly blended the air tube transition and blocked off the little bulb "do-hicky" at the other end)

Thanks, John

[MIKE MOG]

HEY DA_MAXX, WHAY DID YOU HAVE TO HAVE THAT ALLISON REPLACED? [NOISE]?

[moondoggie]

Good Day!

Thanks, birddriver. Guessing your airbox work & 2WD are helping lots. Sure wish I had some time to play with my junk

[birddriver]

Using a Dremal tool I removed all the cross hatch support from the top lid and smoothed it. The air tube transition needs to be rounded as much as posible if you cut to much You can use some of the now scrap and a good soldering iron to weld up holes.
((((( Take the MAF sensor out of the air tube BEFORE you begin )))))

[MikeyLikesIt]

I regularly get 18.6 driving back and forth to work (100 mi per day 60 Hwy/40 City). On the open hwy, the mileage is directly related to speed.
Spd/Mpg
60/24
65/22.6
70/21
75/20.2
80/18

The truck is 100% stock 2002 DA 2500HD CC LB. I run AmsOil 15w-40 synthetic oil and a OEM style K&N air filter.

Mike .T.

[gravity420]

2 years ago I drove from Reno, NV to Anchorage, AK on $232.00 worth of fuel, mainly due to the fact that I only had $240.00 left on me and I was forced to drive this thing like grandma to church. At an average price of I am guessing around $1.50/gal back then divided by 3200 miles or so it comes out to about 20.5 mpg. This is seriously babying it, never acelerating hard from a stop at all and driving at a max of 70mph with the cruise control.

I think that some of you never see over 16-17 mpg because you are as addicted to the right pedal as much as I normally am and enjoy the power and fun that these trucks offer. Those experiencing the high mileage are babying it, never accelerating hard and never drive very fast.

I have also driven about half way thru Canada coming down from Alaska never going under 90 mph and let me tell you I only got about 350 miles per tank. Once I realized how much my speed and acceleration affected mileage I was forced to backoff because at the rate I was going I could not afford the fuel. Then I got up to 600 miles per tank.

So speed and acceleration makes a huge difference. For those of you never getting great mileage, don't feel bad, you are just driving the truck the way it is meant to be driven. There always is a trade-off between mileage bragging rights and having fun, and I suspect that it is way more fun to get worse mileage than it is to drive this truck like a model T just to say how good of mileage you get.

One thing to remember also is sometimes the electronically controlled torque converter slips more than it should, and the truck can feel sluggish and mileage can drop down to the 10-12 mpg range. When this happens, and it happened to me once, if you do the tranny reset sequence, which is going 50+ and shifting to first and bringing it down to a stop 3X in a row it will reset the computer and Voila, the mileage and power is back.

[besintx&co]

Thought I would add to the mileage info,just bought used 2002 Silverado C/C D/A.Am getting 18mpg empty hiway,17 around town short trips,Towing 28' Jayco probably around 14-15 thousand gross 11 mpg through Texas and I-40 into NM turned north into 30-40 mph headwind to Alamosa Co. 9mpg. Came across mountains into Grand Junction 12 mpg I would like to do better but am satisfied so far. The D/A will certainly pull,Let the Allison do it's thing,dropped out of overdrive occasionally in the mountains and strong headwinds.Running 60-65 mph Shorty

[SoTxPollock]

I didn't see anyone mention this so I will. Its not only your rate of acceleration that counts for fuel mileage, its also your rate of deceleration. I suspect that is where a lot of you are loosing out. With these high compression engines if you just jump off the accelerator you are wasting a lot of energy stored in the velocity of the vehicle. You've spent the $$$ to get it up to speed which is where most of the fuel energy is used. It doesn't take much to hold a steady speed. To keep from loosing more fuel mileage decelerating try just backing off a little until you see the speedometer just start to decend. Try to keep the rate of decent in the area of coasting, where you are not using the engine to drag down the vehicle speed quickly but a just supplying enough fuel to keep it at a rate of slow decent. Your best mileage will be when you accelerate and decelerate at a slow rate and cruse at a steady speed for hours at a time, like out in the middle of nowhere. Remember its the rate of change that makes the difference. Food for thought.

[mrdfred]

For all of you using chips/programers, remember your truck DIC MPG reads too high when using chips/programers. You have to calculate the MPG the old fashoned way. By the way, the DIC Gallons used display also reads inaccurate, too low, you have to use the pump reading when doing you MPG.

[okeehandyman]

I purchased two 05 trucks in nov & dec 04. both are 2500hd 4x4 d/a's one cc & one ext c. I drove each of them kenosha, wi. to florida. they both got 22-23 mpg for the whole trip. now one has 13k miles and one 6k mi. one is avg 16 mpg and the other 17 mpg local driving. when we drive out of town & run steady we see much better mpg, as expected. the secret,i think,is keeping your foot from showing you how much power is under the hood! i carry a lance 915 truck camper sometimes. with that,i get only i5mpg on the highway - but i keep the speed down to 60 to 65.

[user3681]

Unfortionatly I'm within city limits and not far from work, so I average 20 city miles daily back and forth in my 2001 Silverado. So that puts me somewhere about 13 mpg. Over the highway though I get between 17.5 and 19, traveling at 70 MPH. I'm sure the camper shell is helping cut into that. But for the size of the vehicle it really isn't bad.

[EZ39e]

2001 3/4 ton, 19 combined 25 highway. These are documented from 0 miles to over 100,000. Highway speed is 70 MPH.

[19poptop39]

With 34,500 miles on the odometer, and towing a 8,400 pound Airstream trailer, I'm getting 13.7 mpg in hilly country at 65 mph and about 14.7 mpg on the level. Solo, I get about 19.1 mpg at 65 mph on the level and about 16.8 in the hills. Around town (---mostly level,) I average about 14.5 mpg running solo. The truck has a hard fiberglass tonneau with a normal 500 lb cargo load in the bed - for an all-up weight of 8,400 pounds (---same as trailer.) These numbers all go down about 1.5 mpg using winter fuel blends in Maine.

2003 GMC 3500 Duramax CC, LB, 4WD

[Driveshaft]

I JUST RECENTLY DID SOME MILEAGE CHECKING. EMPTY WEIGHT IS 7000 LBS. GOT 18.7 MPG CRUISING AT 65 TO 74 MPH. TOWING EMPTY 4000 LB. TRAILER GOT 14.3 MPG, LOADED WITH APPROX 4000 LB. JOHN DEERE TRACTOR, 11.7 MPG. COMBINED TOWING SAME TRAILER LOADED AND EMPTY WAS AN EVEN 13 MPG. THIS WAS DONE OVER APPROX. 600 MILES. TRUCK IS STOCK WITH SWISS CHEESE AIR BOX. ALL HILLY AND FLAT GROUND. TRUCK IS '01 2500 WITH DURAMAX/ALLY COMBO. SPEED WITH LOAD WAS AGAIN 65 TO 74 MPH.

[Driveshaft]

ALSO, FORGOT TO ADD THAT MOST WAS WITH CRUISE CONTROL ON. WHEN TRANNY STARTED DOWNSHIFTING ON HILLS I TURNED OFF CRUISE AND DROVE WITH FOOT AND IT DID NOT DOWN WHEN I WATCHED MY SPEED, WOULD BE DOING AROUND 74,75 AT BOTTOM OF HILLS AND AROUND 66 TO 70 AT TOP.

[canucktravellers]

Towing Yes No
US MPG 12.53 16.56
Cdn.MPG 15.05 19.88
L / 100 Kms 18.75 14.19

1.) Done over 50,000 Kms, over two years.
2.) Tires changed to 265 and Speedometer out by 5% ie under running by 5%
3.) 160 Fillups.
4.) Traveled all over eastern Canada, Florida, Texas.
5.) Towing a 37 foot Titanium Fifth Wheel.
6.) Truck is an Extended Cab with a RETRAX Tonneau & Stock Tailgate.
7.) Fifth Wheel weighs 11,400 Lbs.
8.) GCW is 18,400 Lbs

[Cranke578]

Hi I have a 2002 3500 4 wheel drive crew cab dually stock with edge jucie set at 90 hp. I get aprox 440 miles per tank before the feed me light comes on (30 gal.)empty town/city driving or 13 mpg. I tow a 36 ft gooseneck race trailer and get aprox 10 mpg consistanly. I do not baby it and I drive & tow at 70mph.

I have been disapointed in the milage until I see other Duallys in the same "ballpark". Those extra tires and wider areo do hurt rolling resistace.

[BobNelson]

82,000 miles now on six tires, and overall with fairly meticulous records, I have 13.85 mpg. With the camper on and toy box behind, seems like the average is about 11. Best recorded hwy empty is 18.2, but generally about 15.5

[markff99]

Lead foot Average.
75 MPH Highway
Almost legal around town
Avg 15.5 MPG
All Unladen.

[Olden_B]

I have been amazed by those who post that they are getting better than 15MPG highway or other. I currently own two 6600 durmax's 2004 models, in silverado package Z-71 4X4 crew cab/short box 2500. Both have recently been put through the 30,000 mi program, at a cost of $700 per vehicle. NEITHER of my trucks which are almost exclusively driven on the highway get better than 13.5 almost always 12mpg. with cruise control on at 70. Does anybody have a clue why they are both getting such poor fuel economy. My local dealer has put them both on the computer, replaced the fuel regulator on one and the injectors on the other and still there has been no improvement, and an actual reduction in performance of the other. HELP??
Thanks!
Bill

Originally posted by More Power:
Fuel economy is one of the top 2-3 reasons why most people buy a diesel pickup.

What we want to do here is help determine what people are seeing for non-towing fuel economy in actual on-road use.

Let us know what your truck delivers.... This poll is for owners of the LB7 (2001-early 2004 model Duramax 6600 engines). We are assuming summer blend fuel.

You will need to vote before viewing the poll data. If you don't own an LB7, but would like to see the poll data, you'll need to first vote in the poll using the "Don't Own an LB7" selection for both the local driving and highway driving sections.

Round your fuel economy averages to the nearest whole number. For example a 16.4-mpg would be 16, a 16.8-mpg would be 17.

MP

[redrider#1]

Olden, I am in the same boat as you. I just purchased a 2004 Silverado, D/A, crew cab, 4x4, long box and even though I have put few miles on it, I am getting nowhere near the mpg that everyone else has been reporting. So far I have been getting about 13-14mpg totally unloaded highway miles at 75mph. As I have a broken leg right now I have not been able to investigate further(air filter, fuel filter, etc.) What gives?

[Mudflap]

Around town I can't keep my foot out of it 15-16 mpg tops. On the road I set the cruise between 1800 and 2000 rpm 19-20 mpg all day, drops off a little in the mountains. 107,000 miles

[FireMedic]

Received Truck Dec 9, 2000 7 miles on OD
As of 7/15/05:
Mileage: 93,262
Hours: 2704.6
MPG Average: 16.6
(SF Bay Area Commute Traffic Range from 15.6 - 19.0)
Best Tank: 22.0 Road trip on cruise at 69mph

[hotwelder5]

names tony
I have a 2003 2500 with the edge extreme ,6"lift 35" tires 4" magnaflow exhaust & K&N filter & in town i get about 18 & 21 on freeway at 80mph, Im a happy camper, also 16mph towing my 21 foot boat up hill.Again very happy

[dmaxster]

with 124,075 on it I get an average of 19.2-20 hwy if I taker easy....driving around 60. at 70 i get 18.5 and city hwy I get 17.9 .... all and all I am really pleased. when I towed my buddy's gooseneck we weight GCVW 22,500 LBS then I was getting around 12 maybe 10 if Windy and Hilly but usually 12 MPG. All I can Say is SMILE EVERYTIME I start this BABY !!!!! :D :D :D :D

[chrisinkanata]

With very conservative driving i.e. 100-105km/h (62-65mph) unloaded over long distance consistently 26.5-26.9 Imperial mpg (22.4 US mpg). I have repeated this many times in the warm summer months with the stock 245's. BTW...speedo out by 2-3 mph according to my GPS. Understandable though since the tires are almost done and will be replaced over the winter while the snows are on the truck.

Towing - 7000lbs travel trailer (truck has a cap tapered up towards the rear and acts as a very good windbreak) ---- again very conservative driving and 18.3 to 19 Imperial mpg depending on terrain. (15.2 US mpg).

City summer driving same as towing.

I do notice that when I put the snows on (265's) the milaege takes a substantial hit. Empty hwy falls to 21-22 Cdn (17.5 US mpg). Two parts to that I think....larger tires (I use the GPS to record distance, not the odometer) and far colder temps. I wanted to replace the 245 summer tires with 265's but don't think I will based on that difference. I should put the snows on now while it's still fairly warm and see what the mileage is like.

Chris

[AlaskaDmax]

2002 CC/LB
Best HWy --- 21mpg normal is 19.5 to 20.
Day to day driving is about 22 miles each way, half hwy at 80 mph and half city stop and go = 16.5 to 17 mpg. I get 540 miles out of a tank if I push it to fumes on an average tank. I drive like an idiot, hard acceleration (2800 - 3000 rpm)from almost every red light. I have tried to keep it under 2000 rpms for a full tank, just to see what kind of economy I could get but I can't do it...I am too weak.
Lowest I've ever seen is 14 mpg on the Hwy...bro in law was drafting me through Nebraska...he said it was the best mileage he ever got!!!!!

[mhagie]

Bought truck last saturday(10/29/05)in central Indiana drove it home to SE Iowa 439mi @ 19.4 mpg
Not going to complain.
Merle

[noknock]

Alright this isn't scientific or anything but this is what I came up with. I just drove from near Indianapolis to near Gunnison, Colorado for our annual elk trip. I reset the computer stuff to zero on the personal trip option (DIC).

I have 22,000 miles on my extended cab 2003 with 265 tires.

I weighed the truck empty and with trailer, full tank of fuel each time.

Truck weight with tool box, full tank of fuel, and no people= 6700 pounds.

We ran about 66 mph out there and according to receipts and old fashion math that = 17 mpg. Oh yal the utility trailer is a dual axle that we stuffed 3 quads on with other junk for a weight of 5200 pounds loaded.

Total round trip= 2634 miles

computer says = 14.0 mpg average

receipts and my math say = 14.8 mpg

average mph = 48

computer says 188.3 gallons used

receipts say 190.5 gallons used

There were about 10 times in Kansas that we were bored and kept the spedometer on 60 mph and then started the timer at the mile marker, consistantly we were at about 58 - 59 seconds. So if the spedometer is not already calibrated for 265 tires, then it is pretty darned close.

We were camped at 10,000 feet so says the GPS units we had. I took the truck back on some pretty rough 2 track trails with some really steep hills. The DMAX never missed a beat and I love that allison how it holds it's gear going down severe grades and hills.

The only thing was that when I first started the DMAX in the morning, it would smoke until engine warm up. I don't know if this is a faulty glow plug or what. Temp was around 19 degrees before sunrise. No smoke after engine operating temp was obtained.

The tranny temp stayed below 200 the whole time with the exception of the last 5 miles of the trip going up some really steep 2- track trails pulling the trailer.

This is a stock truck.

I am thrilled with the performance of this truck.

P.S. The Ford 10 cylinder gasser that accompanied us, got 8 mpg towing a 1700 pound pop-up camper. :D

[sjd_sd]

My mileage ranges from about 16 to 20. 16 happens with lots of 4wd use, deep snow and slow driving. 20 happens at a steady 65-70mph on the highway. I have a camper shell and one-size-up from stock tires. The price of diesel makes me wonder if it was worth it. Fuel for a gas-burner is about 40 cents less locally, so its almost a wash.

[schaack2]

Just checked my 2003 crew/short box today and I got 17.3 - only current mod. is 4" exhaust. This tank I just check I had been pretty heavy on the throttle with a lot of town driving. Previously checked tanks were high 18 / low 19 (all calculated manually).

After reading through all the differences in fuel economy, I'm curious which variables make the biggest difference in fuel economy. I've got a laundry list of upgrades to make, regardless of economy, I want to make larger burn-outs!!

How much affect do you guys feel a bed cover or topper makes on fuel economy? I've never had one on a truck but it has to significantly reduce drag (at least one would think). After reading all posts, two of the guys with the best economy had either a topper or a bed cover. What are the thoughts of everyone else on this matter?


Schaack2

[Florey]

Originally posted by birddriver:
Using a Dremal tool I removed all the cross hatch support from the top lid and smoothed it. The air tube transition needs to be rounded as much as posible if you cut to much You can use some of the now scrap and a good soldering iron to weld up holes.
((((( Take the MAF sensor out of the air tube BEFORE you begin ))))) Instead of doing all of that why not just buy a good aftermarket air intake system?