Have you ever peddled a bicycle with under-inflated tires and then noticed the difference in effort after you inflated the tires to their proper pressure? Your automobile feels the same way.

How much of a difference in gas mileage does tire pressure make?

Under-inflated tires lower gas mileage by 0.4% for every 1 psi (pounds per square inch) drop in the pressure of all four tires. The fueleconomy.gov web site estimates that drivers can save about 3.3% off their gas costs by keeping their tires properly inflated.

Proper tire inflation has benefits besides better fuel economy

In addition to the fuel savings, properly inflated tires last longer. So you'll be rewarded in two ways for your diligence.

Lastly, tires inflated to the correct pressure are safer.

The best tools for keeping your tires at the proper pressure