* Tire size: Different tire sizes require different pressures.
* Load: Are you carrying passengers or cargo? Heavier loads require higher pressure.
* Whether it's a spare tire: Spare tires often have different pressure requirements.
Where to find the correct information:
1. The sticker on the driver's side doorjamb: This sticker shows the recommended tire pressure for your specific vehicle and tire size. This is the most reliable source.
2. The owner's manual: Your owner's manual will have a section detailing recommended tire pressures.
3. The tire sidewall: The maximum pressure for the tire is printed on the sidewall (look for "MAX PRESSURE" or a similar marking). Never inflate beyond this maximum. This is not necessarily the *recommended* pressure, though.
Use the sticker on the driver's side doorjamb as your primary source. It accounts for the vehicle's weight and tire size. Always check your tire pressure regularly and adjust as needed.