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Tires tend to lose air over time. You can improve your gas mileage by up to 3.3 percent by keeping your tires inflated to the proper pressure. Buy a digital tire gauge and check your tires once a month and before a long trip. Proper inflation pressures can be found in your owner's manual or on a sticker on the car. Remember to check tire pressure only after the car has been sitting for several hours in order to ensure that the tires are cold -- the friction of driving heats the tires and increases pressure, which can hide an under-inflated tire.
Courtesy of fueleconomy.gov
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