How Temperature Affects Tire Pressure
Tire pressure changes by approximately 1 PSI for every 10°F change in ambient temperature. If you set your tires to 32 PSI in 70°F weather, they will read about 28 PSI when winter temperatures drop to 30°F. This is why TPMS lights often come on during the first cold snap of fall.
Recommended Tire Pressure by Vehicle Type
| Vehicle Type | Front PSI | Rear PSI | Notes |
|---|---|---|---|
| Compact Car | 32 - 35 | 32 - 35 | Usually same front and rear |
| Mid-Size Sedan | 32 - 36 | 32 - 36 | Check door sticker |
| SUV / Crossover | 33 - 38 | 33 - 38 | May differ front/rear |
| Pickup Truck (unloaded) | 35 - 40 | 35 - 40 | Increase for payload |
| Pickup Truck (loaded) | 35 - 40 | 40 - 50 | Rear higher for bed weight |
| Sports Car | 30 - 34 | 32 - 38 | Rear often higher |
Effects of Wrong Tire Pressure
| Condition | Fuel Economy | Tire Wear | Safety |
|---|---|---|---|
| 5 PSI underinflated | -2% to -3% MPG | Outer edges wear fast | Longer stopping, overheating risk |
| 10 PSI underinflated | -4% to -6% MPG | Uneven wear, cupping | Blowout risk, poor handling |
| 5 PSI overinflated | Slight improvement | Center wears fast | Harsh ride, less grip |
| 10 PSI overinflated | +1% MPG | Rapid center wear | Reduced contact patch, skidding risk |
FAQ
Should I use the PSI on the tire sidewall?
No. The number on the tire sidewall is the maximum pressure the tire can safely hold, not the recommended pressure. Always use the pressure listed on the driver's door sticker or in your owner's manual. The door sticker number is specific to your vehicle's weight and handling characteristics.
When should I check tire pressure?
Check tire pressure when the tires are cold (not driven for 3+ hours or driven less than 1 mile). Morning is ideal. Driving heats up tires and increases the reading by 3-5 PSI, which gives a false reading.
Does tire pressure affect gas mileage?
Yes. Underinflated tires increase rolling resistance, which wastes fuel. For every 1 PSI all four tires are underinflated, fuel economy drops by about 0.2%. Tires that are 10 PSI low can cost you an extra 3-6% in fuel.
⚠ Disclaimer
Tire pressure recommendations are estimates based on general guidelines. Always follow the tire pressure specified on your vehicle's door placard or owner's manual — not the maximum pressure stamped on the tire sidewall. Check pressure when tires are cold. Incorrect tire pressure affects braking, handling, and tire life.