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Also keep in mind that tire pressure can drop with temp changes. It is not uncommon for tire pressure to be higher when it is warm outside and low when it is cooler. The rule of thumb is for every 10° Fahrenheit change in air temperature, your tire's inflation pressure will change by about 1 psi. The difference between cold nighttime temperatures and hot daytime temperatures in most parts of the country is about 20° Fahrenheit. So depending on when you check your tire pressure and the temp, it could be between 2 and 5 psi low the following morning.
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