Q:

How does inflating your tires to the recommended pressure help gas mileage?

A:

Quick Answer

Properly inflated tires reduce resistance between the road and the tire, allowing the engine to run smoother. The resistance caused by under-inflated tires causes the engine to burn more fuel as it works harder to propel the vehicle forward.

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Full Answer

Tires inflated to the recommended range of pounds per square inch may improve the vehicle's gas mileage by 3.3 percent, according to the U.S. Department of Energy. Even a drop of 1 pound per square inch in the four tires can reduce gas mileage by 0.3 percent. Most vehicles have a sticker that lists the recommended tire pressure either in the glove box or on driver's side door jamb.

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