Under Pressure…Keeping Your Tires Inflated Will Make Them Last Longer and Your Vehicle Will Use Less Fuel Too!
Even if you have a Tire Pressure Monitoring System (TPMS), as equipped on many newer vehicles, you should check your tire pressures regularly, at least monthly. Most tires lose one pound per square inch (PSI) per month, assuming the temperature does not fluctuate much. If temperatures drop, tire pressures also drop. Every 10 degrees Fahrenheit (°F) drop in temperature causes tires to lose 1°F.
Underinflated tires increase friction against the pavement and can cause excess tire wear, even blowouts when the vehicle is fully loaded or overloaded. You cannot tell the appropriate tire pressure by just looking at the sidewall of the tires and estimating how flat it looks against the pavement. Tires have various sidewall flex characteristics based on their aspect ratio (section height divided by width), traction rating (e.g., A, B, C) and intended use, so use a quality tire gauge to check your tire pressure against specifications.