What kind of fuel mileage you guys getting?

04GMC8100HD · December 8, 2003

I get 12.5 mpg on the hwy with alittle city driving mixed in, and 10.5 mpg pulling my racecar. Maybe once I get my wester's PCM I'll get even better along with more power.

Randy

422 SS · December 8, 2003

Are you compensating for the larger tires you have on your truck when figuring mileage?If so you are getting remarkable mileage.I got 9.7 mpg avg in 58,000 miles with my 02 crewcab shortbed 4x4 8.1.I would get between 6-8mpg pulling my 28ft enclosed car hauler that weighs 8500-9000 lbs at 70 mph.Pulling a open car hauler I would get 9-10mpg.

tmf6902 · December 8, 2003

I get around 11.5 -12 on the highway....with 35's on it.

gunslinger45 · December 9, 2003

Well I have an Avalanche with the 8.1L with the 4L85E tranny. Its a bit different than the Allison, but I get about 9 mpg in town and around 13 - 14 hwy if I drive around 70 (4.10 rear end). Have not towed, so I can't comment on the mpg there.

Gunslinger

496Cubes · December 9, 2003

I get 12-12.5 empty very consistently with mostly highway driving. I use to keep track of mileage all the time and I never broke 13. I get 10 mpg pulling a 18,000 lb livestock trailer. I saw no difference in mileage when I switched to large tires, but its geared low with the 4.10 rearend. Later.

Engineer · December 9, 2003

496Cubes- Got any photos of that rig? Just curious what mine would look like if it were 1 yr newer.

raventai · December 9, 2003

if I can keep my foot out of it I used to average between 11-12 a mostly freeway commute (70-80 MPH) with some around town mixed in

one of my best tanks was towing a Toyota truck on a car hauler from Tennessee , the hauler had no suspension and I had to go slow (50mph IIRC) I got 13.5

since it got cold a few tanks ago I have been getting 9-10 it did not do that previous winters, the truck has been pretty consistent

04GMC8100HD · December 9, 2003

ARE422DP, I corrected for the larger tires, so I feel I'm doing pretty well. Now if Lyndon Wester can hook me up with more power and just a little more mpg I'll really be happy.

Randy

CMNTMXR81 · December 9, 2003

9.78 the last fill up here.

HendyPhoto · December 9, 2003

That's funny, I claimed to get that kind of mileage, and ARE422DP (and others) pounced all over me! I was told I must get the best mileage in the world and I am full of it. SEE, I AM NOT THE ONLY ONE THAT GETS THESE KINDS OF NUMBERS!

tmf6902 · December 9, 2003

I have to say too, that I get that kind of milage on the highway in florida, the biggest hill I climb is an overpass here and there. So I set the cruise to 80 and go.

THE BIGPUNN · December 9, 2003

im getting w/mostly city 9.2 mpg.

BlackSilver · December 9, 2003

21-22MPG empty. 13-14MPG pulling what you see in the photo.

422 SS · December 9, 2003

That's funny, I claimed to get that kind of mileage, and ARE422DP (and others) pounced all over me! I was told I must get the best mileage in the world and I am full of it. SEE, I AM NOT THE ONLY ONE THAT GETS THESE KINDS OF NUMBERS!

I still dont see how you guys get the same mileage a stock tired truck gets with that huge rubber you have.I have owned a truck with 35 inch tires and saw a huge decrease in mileage after putting on the big boys.My 96 K2500 HD with 5.7 went from 14mpg stock to 10 mpg with 35's.I used to belong to a 4x4 truck club and every single person saw a mileage drop after putting on bigger tires.What formula are you guys using to correct for the 20% taller tires.I still find it very difficult to believe that a 35 inch tired truck gets better mileage than my stock truck did.If you guys had stock rubber you would be getting 15-16mpg.Please elaborate.