LMM Fuel Economy

[jharden1]

17.6 DIC on the last 1600 miles. Mixed miles. 7500 miles on the truck.

[craigth]

I am VERY unhapp with my LMM 2008 GMC 2500HD Crewcab SWB 4WD gas mileage!! My '02 of the same model got 100 miles to the tank better than the '08! I'm really surprised that 6 model years later and with the fuel price/supply issues that GM could not at least maintain the mileage of my '02 or make it better! I wonder if a power programmer would help?!?!

[Stlheadake]

Craig, I would be careful putting a programmer in that truck. From what I understand, you run the risk of clogging the DPF with a programmer. Not a cheap fix for more mileage.

I too have been in the 'hunt' for better mileage. My '06 doesn't do too bad 15 city and as high as 18-19 hwy (about 70mph). Still I feel it could/should do better.