Several things you can do.Put on dual exhaust make sure to keep the cat converters.A KN air filter, A throttle body spacer, Synthetic motor oil,Add fuel injector Cleaner.Make sure you tires are aired to proper presssure.And finally slow down and avoid fast starts.I have noticed with my 07 Chevy which has all this done that I get better mileage keeping the rpm below 2000.I get 19 mpg on the road.It's a crew cab 4x4.Good Luck. The chip will void your lifetime warranty