Duramax mileage - 22 mpg? - diesel forum - thedieselstop., Frankly this is a nit with me, i'm tired of people claiming these high mileage numbers! can you help with this argument. i don't have any data to. Diesel mpg & fuel efficiency | duramax engine, Gmc offers a variety of vehicles with superior fuel efficiency when it comes to diesel mpg.. Lmm fuel mileage sucks! - duramax diesels forum, Lmm fuel mileage sucks! smoke signals 2002 lb7 ecsb summit white gt4088r, 45% injectors, stage iii stroker cp3, cognito ntbd 4-6", efi live dsp5, airdog 150, rdl.
Duramax diesel get 4-7 mpg fuel mileage increase, Gain up to 4-7 more miles per gallon with custom tuning of your duramax diesel engine control module. fuel mileage increase is possible.. How to improve mpg in '02 6.6l duramax??? - thedieselpage, How to improve mpg in '02 6.6l duramax??? duramax 6600. Upgrades to improve duramax fuel economy - chevy and gmc, I have an 03 gmc 4x4. thus far i have been dissapointed with fuel economy. i am getting close to 100k and have been averaging about 16 mpg with mixed.