fuel mileage
5

Asked by Daniel Mar 14, 2010 at 12:24 AM about the 2003 GMC Sierra 1500

Question type: Car Customization

so, im trying to get as much fuel mileage of out my truck as possible. its a '03 4x4 extended cab with 3.73 front and rear gears, k&n cold air intake and cherry bomb exhaust. i've got 285/50/r20 nitto dune grapplers on it. i'm getting about 15mpg on the highway. any suggestions?

2 Answers
16,160

Larry answered 14 years ago

Switch to a smaller street only tire, change your gears, use a synthetic oil, keep the right tire pressure, get rid of dead weight, run tonneau cover, and buy a programmer.

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