Keep your foot off the gas pedal. Don't drive it like you stole it.
Just kidding, keeping a clean air filter, fuel filter, and the throttle body clean all helps. Another is to make sure you have the proper air pressure in the tires, and the oil changed out when it is suppose to be. Just having a properly maintained engine will always give you the best gas mileage.
Add some Lucas Fuel Injector cleaner to the gas tank I know it makes a difference in my gas mileage when I use it.
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