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Keep your vehicle well maintained
A car in poor running condition will use more gas than one that has been tuned up. According to this checklist at Advance Auto Parts, a dirty air filter can reduce gas mileage up to 20%. They also note that spark plugs in poor condition can reduce gas mileage up to 12%
Keep tires properly inflated
Underinflated tires aren't just dangerous - they devour fuel economy by as much as 25%! (I know this from experience - whenever I notice a drop in MPG, my tires are usually low.) Overinflated tires aren't efficient, either. Also keep your tires balanced and in alignment.
Don't top off your tank
Trust the auto-shutoff. Overfilling can lead to wasted gas.
Be sure your gas cap is tight
"Improperly seated gas caps allow 147 million gallons of fuel to vaporize every year in the U.S.
Don't idle
Turn off your engine if you'll be idling for more than thirty seconds. Starting your vehicle does use a burst of fuel, but not as much as allowing the engine to idle too long.
Keep your cool
Most people claim that it makes more sense to use air conditioning on the highway, and to roll down the windows in city traffic. It's commonly claimed that either method is going to reduce your fuel economy by about 10%. But according to research performed by found, there's no real difference between driving with the windows down or using the air conditioner.