Keeping your car tires properly inflated is a straightforward task that improves safety, fuel efficiency, and tire longevity. You'll need a tire pressure gauge and an air compressor, which is available at most gas stations.
Start by finding the correct PSI (Pounds per Square Inch) for your vehicle. This information is not on the tire's sidewall, which shows the maximum pressure. Instead, check the driver's side door jamb, the glove compartment door, or your owner's manual for the manufacturer's recommended cold tire pressure. "Cold" means the tires haven't been driven on for at least three hours, as pressure increases with heat.
Remove the valve stem cap from the first tire and keep it in a safe place. Press the tire gauge firmly onto the valve stem. You’ll hear a brief hiss of air. The gauge will pop out and show a reading. Compare this to your vehicle's recommended PSI.
If the pressure is low, attach the air compressor hose to the valve stem. Add air in short bursts, checking the pressure with your gauge after each burst to avoid over-inflation. If you over-inflate, briefly press the center pin in the valve stem with your gauge to release air. Once the pressure matches the recommended PSI, re-check it with your gauge, then screw the valve stem cap back on tightly. Repeat for all four tires, and don’t forget your spare tire.
| Vehicle Type | Typical Recommended PSI Range | Common Source of PSI Info | Consequence of Low Pressure (10 PSI under) | Consequence of High Pressure (10 PSI over) |
|---|
| Sedans & Coupes | 32 - 35 PSI | Driver's Door Jamb | ~5% decrease in fuel economy | Uneven tire wear (center) |
| Small SUVs & Crossovers | 33 - 36 PSI | Driver's Door Jamb | Reduced tread life by 15% | Harsher ride quality |
| Full-Size Trucks & SUVs | 35 - 45 PSI | Glove Box or Door Jamb | Increased risk of blowout | Reduced traction |
| Performance Cars | 38 - 45 PSI | Owner's Manual | Poor handling and cornering | Less stable braking |
| Electric Vehicles (EVs) | 38 - 42 PSI (often higher due to weight) | Driver's Door Jamb | Reduced driving range | Increased road noise |
