Upgrades improve duramax fuel economy - chevy 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. Diy diesel conversion kit hummer duramax engine increase, Finally, a kit to convert your hummer yourself to the legendary duramax diesel. this kit consist of all components, except, for the drive train, which can be. Diesel mpg & fuel efficiency | duramax engine, Gmc offers a variety of vehicles with superior fuel efficiency when it comes to diesel mpg..
Increase my duramax fuel mileage - youtube, Http://www.powerupdiesel.biz looking for better fuel mileage with your duramax diesel? duramileage custom tuning can give you up to a 4-7 mpg gain. 1-888. 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 increase horsepower and fuel mileage in duramax diesel, Easy ways to increase horsepower and fuel mileage in duramax diesel trucks. heavy duty diesel performance products cut maintenance costs in half..