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Use the grade of motor oil recommended by your car's manufacturer. Using a different motor oil can lower your gasoline mileage by 1% to 2%.
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Keep tires properly inflated and aligned to improve your gasoline mileage by around 3.3%.
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Get regular engine tune-ups and car maintenance checks to avoid fuel economy problems due to worn spark plugs, dragging brakes, low transmission fluid, or transmission problems.
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Replace clogged air filters to improve gas mileage by as much as 10% and protect your engine.
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Combine errands into one trip. Several short trips, each one taken from a cold start, can use twice as much fuel as one trip covering the same distance when the engine is warm.
Courtesy of the US Department of Energy
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