How does temperature affect tire pressure?

You may have noticed on cool mornings, your tire pressure light comes on.

This is because cooler air causes the air in your tire to contract and the pressure in the tire to drop.
In fact, it drops about 1 psi per 10 degrees Fahrenheit, and rises at the same rate when the temperature increases.
The light often goes away after you start driving because friction between your tires and the pavement causes the air to heat up and the pressure to rise…but this causes a misleading reading.
The solution is to check your tire pressure when it is colder and adjust it according to your driver’s manual or the suggestion on the inside of your driver’s side door.
A properly inflated tire will lead to better gas mileage, a smoother ride and prevent overheating in the tires.


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