How to Tune Your Own Car for Better Gas Mileage

Use a Fuel System Cleaner

Fuel injectors and engine components can get gummed up over time with residuals of gas and the best way to restore your vehicle to its original state is to run a quality fuel cleaner through your gas tank every 6 months to a year.

BG 44K is probably one of the best commercial fuel injector cleaners on the market. If your engines fuel system is to clogged up for this stuff to work, then you'll have to get your engine professionally maintenanced by a mechanic.