Does Higher Tire Pressure Save Fuel?
3 Answers
Higher tire pressure reduces the contact area between the tire and the ground, which can indeed save fuel. However, the tire pressure should not be too high, as it may affect traction and vehicle handling. Tires are the only components of a car that come into contact with the ground, playing a crucial role in driving stability and safety. Tire pressure should neither be too high nor too low. The normal tire pressure typically ranges between 230 to 250 kPa, or 2.3 to 2.5 bar. For specific tire pressure standards, refer to the user manual. Tires require the correct air pressure to function effectively; both excessively low and high tire pressures are detrimental.
I've been repairing cars at the dealership for over a decade, and I'm often asked if higher tire pressure saves fuel. Theoretically, yes, because increased tire pressure reduces the contact area between the tire and the road surface, decreasing rolling resistance. This means the engine doesn't have to work as hard, saving a small amount of fuel—roughly about 1-3% in fuel consumption. However, this practice comes with significant risks. Overinflated tires wear unevenly, with the center wearing out faster while the edges remain intact, shortening the tire's lifespan. The ride also feels much stiffer, making bumps or potholes uncomfortably jarring. More importantly, it's a safety hazard—overinflated tires are more prone to blowouts, especially at high speeds or in hot weather, which can lead to loss of control and accidents. I advise both new and experienced drivers not to chase these minor fuel savings. Instead, regularly check the manufacturer's recommended tire pressure (usually listed on the door frame) with a tire gauge and maintain it around 32-35 PSI for the best balance.
I usually drive to and from work, and last year I tried inflating my tires to 40 PSI to save some fuel costs. Indeed, I saved a liter or two of fuel each month, but the ride comfort was terrible—the seats felt like wooden boards, and the bumps made my back ache. The tires wore out quickly and became deformed in less than six months. The cost of replacing a new tire was hundreds more than the fuel I saved. Now I see it clearly: saving that little bit of fuel isn't worth it. Driving at normal tire pressure is smooth and safe. For daily driving, remember to check your tire pressure regularly using a mobile app or a roadside tire gauge. Don't take risks for small gains.