Maintaining correct tire pressure is one of the simplest and most impactful things you can do for your car's safety, fuel economy, and tire longevity. Both under- and overinflation cause problems — here's how to get it right.
Correct inflation keeps the tire's contact patch the right shape and size, which maximizes traction and minimizes wear. Underinflation increases rolling resistance (hurting fuel economy), causes heat buildup (which degrades rubber faster), and leads to edge wear. Overinflation reduces the contact patch, decreases wet-weather grip, and makes the tire more susceptible to impact damage. The U.S. DOT estimates that about 28% of passenger vehicles are driving with at least one significantly underinflated tire.
The correct pressure is on a sticker inside your driver's door jamb, or in your owner's manual. It is NOT the number on the tire sidewall — that is the maximum pressure the tire can hold, not the recommended operating pressure. Front and rear recommendations may differ. Most passenger cars require 32–35 PSI; some trucks and SUVs require higher pressures.
Check pressure when tires are "cold" — meaning the vehicle has been parked for at least 3 hours or driven less than a mile at moderate speed. Remove the valve cap from the valve stem, press a tire pressure gauge firmly onto the valve, and read the pressure. If it matches the recommendation, you're done. If not, add or release air as needed.
Check pressure at least once a month and before every long road trip. Also check after significant temperature changes — tire pressure drops approximately 1 PSI for every 10°F drop in temperature. Your TPMS (Tire Pressure Monitoring System, if equipped) warns when pressure drops 25% below the recommended level — but this is a warning threshold, not a maintenance target. Don't wait for the TPMS light.
