Save money and fuel. Keep tires inflated.

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Incredibly, as much as 15 percent of the energy required to move your car down the road goes to overcoming rolling resistance, which is the friction of the tire against the road surface. To maximize fuel economy, make sure your tires are inflated to the pressure recommended on the vehicle’s tire placard, which is usually found on the driver’s-side doorjamb.

Carry a digital tire pressure gauge, and top off the air in your tires whenever you fill up your gas tank. Losing just a few pounds per square inch (psi) of pressure will lower your mileage. When it’s time to replace your tires, consider a set of the new lower-rolling-resistance models offered by many manufacturers. Air is free, so keep 'em filled up.