Correct Tire Pressure: What PSI Should Your Tires Be?
Correct tire pressure improves safety, fuel economy and tire life. The most common mistake is using the wrong number.
Use the door-jamb number, not the sidewall
The PSI printed on the tire sidewall is the maximum the tire can hold, not what your car needs. The correct pressure is on the placard inside the driver's door jamb (also in the owner's manual). Most passenger cars call for 32 to 36 PSI.
How to check
- Check when tires are cold: before driving, or after the car has sat for a few hours.
- Use a reliable gauge; gas-station gauges can be off.
- Check all four tires, and the spare if you have one.
How often
Check at least once a month and before long trips. Tires lose about 1 PSI per month naturally, and about 1 PSI for every 10°F drop in temperature, so the first cold snap often triggers the warning light.
Under- and over-inflation
Low pressure wears the outer edges, hurts fuel economy and can overheat the tire. Too much pressure wears the center, makes the ride harsh and reduces grip. If a tire keeps losing air, have it inspected for a nail or a leaking valve.
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