Q

Does tire pressure affect gas mileage?

Tire pressure does have a significant impact on fuel economy, and proper tire pressure can effectively reduce fuel consumption. When tire pressure is maintained within the standard range of 2.2 to 2.6 bar, the rolling resistance of the tires and the friction with the ground reach an optimal balance, resulting in the best fuel efficiency. If the tire pressure is 10% below the recommended value, fuel consumption may increase by approximately 2%. For example, when the standard tire pressure of 2.2 bar drops to 2.0 bar, fuel consumption rises by 2%, and when it drops as low as 1.4 bar, the increase in fuel consumption can reach 8%. Insufficient tire pressure causes increased tire deformation, enlarges the contact area with the ground, raises rolling resistance, while also accelerating shoulder wear and shortening tire lifespan. Conversely, although excessively high tire pressure theoretically reduces resistance, it decreases grip, increases the risk of tire blowouts, and leads to abnormal wear in the center of the tread. It is recommended to adjust the tire pressure according to the value specified in the vehicle manual (usually located on the door frame or fuel tank cap) and in combination with seasonal variations: set it to the lower limit of the recommended value (e.g., 2.3 bar) in summer, adjust it to the upper limit (e.g., 2.5 bar) in winter, and increase it by an additional 0.1 to 0.2 bar when the vehicle is fully loaded. Check the tire pressure at least once a month when the tires are cold, ensuring that all four tires maintain consistent pressure. This practice not only saves approximately 3.3% in fuel costs but also ensures driving safety and tire durability.
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