Does Low Tire Pressure Increase Fuel Consumption?

[DiAlex]

If the tire pressure is too low, the vehicle's running resistance will increase, and the overall fuel consumption will also rise. According to the international GBT2978-2008 standard, the recommended tire pressures for different types of tires are as follows: Standard tires: 2.4-2.5 bar; Reinforced tires: 2.8-2.9 bar; Maximum pressure: should not exceed 3.5 bar. Other hazards of low tire pressure: It can cause the steering wheel to feel heavy and lead to vehicle drift, which are factors detrimental to driving safety; It increases the movement of various parts of the tire, leading to excessive rolling and abnormal heating; It reduces the functionality of the cords and rubber, causing delamination or cord breakage, and excessive friction between the tire and the rim, resulting in damage to the bead area and abnormal wear; The friction between the tire and the ground increases exponentially, causing the tire temperature to rise sharply, the tire to soften, and its strength to drop drastically. High-speed driving under such conditions may lead to tire blowouts; It increases the deformation of the tire body, making the sidewalls prone to cracks, and generates flexing movements, leading to excessive heat, rubber aging, fatigue in the cord layers, and cord breakage. It also increases the tire's contact area with the ground, accelerating wear on the tire shoulders.

[ClaireDella]

Having driven for over a decade, I can definitively say that low tire pressure absolutely increases fuel consumption. When tires are underinflated, their contact patch with the road expands - just like walking in soft-soled shoes requires more effort. This increased friction between tires and road surface forces the engine to work harder to turn the wheels. Last week when I helped my neighbor check his tire pressure, we found all four tires were 0.3 bar below standard. He'd been complaining about a sudden 7% increase in fuel consumption. Remember to check cold tire pressure monthly with a mechanical gauge, especially during seasonal transitions when temperature fluctuations make pressure changes more pronounced. Just a 10% deviation in tire pressure can increase fuel consumption by 2% - the extra money spent on gas could practically buy you new tires.

[AnastasiaLynn]

Last month, I checked the tire pressure with a gauge. The manufacturer recommends 2.5 bar, but the right rear tire was only at 2.1. On the highway, I clearly felt the steering was heavy, with a dragging sensation. The mechanic said that under-inflated tires deform more, forcing the engine to inject more fuel to maintain speed. After topping up the air, fuel consumption immediately returned to normal. Keeping a cheap tire pressure gauge handy is the most worry-free solution. Using the free air pump at the gas station to refill takes just three minutes—much more cost-effective than spending an extra hundred bucks on fuel every month.

[LoganLee]

During the last maintenance, it was found that the left front tire was underinflated by 0.5 bar. The mechanic waved a tread depth gauge and said, 'If you don't inflate this tire soon, the sidewall will crack.' An underinflated tire feels like it's being sucked by the road when rolling, increasing engine load by at least 5%. Now I always ask the car wash to check the tire pressure. A reminder to everyone: new cars often come with higher default tire pressure, so always refer to the sticker on the door frame for accurate data. Tire pressure drops quickly in winter, and snow tires need to be checked even more frequently.