Under tire pressure at the pumps
Did you know that you can help maximize your fuel efficiency simply by properly maintaining your car’s tire pressure? This seemingly simple task can consume less fuel and make your tires last longer.
How poorly are tires inflated in this country? A recent Rubber Manufacturers Association (RMA) survey found that just 19% of the drivers check their inflation pressure properly. The same study mentioned that properly inflated tires can improve gas mileage by about 3.3%. Less air means more force to get the tire rolling, causing increased air pollution and fuel consumption. Tires lose air pressure over time, so if you haven’t checked your tire pressure in the last few months or longer, chances are that they are under-inflated. Our own fuel economy testing showed a 1.3 mpg loss in highway fuel economy in a Toyota Camry when the tires were deflated by 10 psi. Bottom line: Check your tire’s inflation pressure at least monthly and do it when the tires are cold. Finding your tire’s proper inflation pressure is simple, but here’s a hint: it’s not the number listed on the sidewall of the tire--that’s the maximum inflation pressure. A placard identifying the recommended pressure is usually mounted on the door jamb, inside the glove-box lid or fuel-filler door, or listed in the car’s owner’s manual. Inflation pressure directly affects tire load capacity; tires with too little pressure will overheat leading to failure, poor handling, and quick wear. Conversely, too high a pressure and the tires will ride stiffly, grip less, and, again, wear out prematurely. Low pressure usually results in fast shoulder wear; high pressure can result in fast center wear. Proper pressure delivers even tread contact to the road, balanced wear and optimum grip. It’s best to stick with the recommendation for the vehicle, as it’s designed to provide the best balance of longevity, ride and handling, and all-around grip.
Learn more about tires, and see our complete ratings, in the Tires section of ConsumerReports.org.
--Gene Petersen
