07.5+ LMM Duramax PowertrainDiscussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect
I have a little less than 13000 miles on mine and I am averaging 13.5 over that time. Hand calc's and computer have been fairly consistent over that time. Towing has been less by hand calc, cruising has been slightly higher by hand. I get 9-10mpg's towing 15000lbs at 70 or so and 7-8 towing that same load at 80.
On road trips with out a load and a hard top tonneau cover I get 16-17 at 80 give or take a few mph.
For a comparison at 13000 miles on my 04' i was averaging 13 mpg's with nothing to tow, but it got better with time and miles.
I am not so sure this one will
__________________ Had an 04' Duramax LB7 thought i needed a new one.
2009 GMC 2500HD SLT black on black very nice truck.
12500 miles and counting
Stock right now but that will change soon
Mines coming up on 20k, basically stock. 16.8, hand calc (the computer says a bit over 17 most of the time), mixture of city and highway, not much freeway. I get around 12 towing a 10k lb trailer, have gotten 20.1 on freeway trips.
just getting ready to click 40000 miles and Im getting 11.5 consistantly....for the longest time it was 12.7.....its bone stock, has 2 bed side top mount toolboxes....those, and the ladder rack have made no difference in mileage either.....best ever was like 15.5 on a trip
__________________ The Toy....97 F350 CC Long Bed, 4x4, Built E4OD, Oxford White, cold air kit, 08 Finned Aluminum Diff Cover, FPR mod, 285's, 4 inch straight into Dual 5" Grand Rocks Stacks with a Me built bed kit and more on the way.
The Workhorse....07 GMC 2500HD Duramax...LMM with emmsions....what an effin joke....DPF Delete coming son
running empty I get 13-15 mpg and pulling a 24ft horse trailer with living quarters I get 8.5 mpg. I have not had great mileage but then I drive a oneton dually so it not made for mileage I guess I will just have to live with it.
Took my new truck on a trip this weekend. Nothing but interstate driving from WV to SC and back with the cruise set on 75 everywhere (except VA-70) and I got 15.3 mpg. Truck has 1300 miles now.
__________________ 2009 Crew Cab 2500HD. Bone stock.
My rides average is 15.8 with almost 28,000 miles and getting at last fill 13.3 MPG'S and hard on her everyday...
__________________ 08 2500 LMM Z71 Hd with a Ready lift leveling kit,Banks monster exhaust,K and N filter,max energy programmer set at stage 3 a 91Hp tune,transgo,PPE shim kit, Jr 18-9 pro comp rims sitting on 325/60 r 18's Toyo A/t's,Westin Chrome nerf bars and Plasma Glow low beams and all emblems are gone except for the Z71 and Duramax on the hood,molding gone too.
now i have 18,000 miles on it and still no difference from 5,000 miles about 14 mpg in town and 17 on road
__________________ Tom's new truck: red 08 duramax lmm , LTZ, crewcab 3500 4x4, stock for now for towing racecar trailer #10000lb's , spray in liner, has black aftermarket ranchhand cowboy bumper with cowcatcher for that sinister look , matching back bumper, added a toolbox in bed , new lights on push bar , cb chip to come later remember old age isn't for sissies !! never hollar whooaa!! http://i335.photobucket.com/albums/m...1/P9150004.jpg
I have a little less than 13000 miles on mine and I am averaging 13.5 over that time. Hand calc's and computer have been fairly consistent over that time. Towing has been less by hand calc, cruising has been slightly higher by hand. I get 9-10mpg's towing 15000lbs at 70 or so and 7-8 towing that same load at 80.
On road trips with out a load and a hard top tonneau cover I get 16-17 at 80 give or take a few mph.
For a comparison at 13000 miles on my 04' i was averaging 13 mpg's with nothing to tow, but it got better with time and miles.
I am not so sure this one will
you are fighting the altitude there also, i used to live off copper and juan tabo love the avatar, also, hope the basketball team will do more than the football team , go LOBOS
__________________ Tom's new truck: red 08 duramax lmm , LTZ, crewcab 3500 4x4, stock for now for towing racecar trailer #10000lb's , spray in liner, has black aftermarket ranchhand cowboy bumper with cowcatcher for that sinister look , matching back bumper, added a toolbox in bed , new lights on push bar , cb chip to come later remember old age isn't for sissies !! never hollar whooaa!! http://i335.photobucket.com/albums/m...1/P9150004.jpg
Last edited by tshideler : 11-02-2009 at 07:07 AM.
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thought i needed a new one.
chip to come later remember old age isn't for sissies !! never hollar whooaa!! 
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