Recommended tire pressure varies depending on tire type, according to Firestone. This information is normally available and posted on the door of the vehicle, fuel door or glove box. Firestone's website also has an online tool that recommends tire pressure for various vehicles and tire sizes.
The recommended tire pressure is normally lower than the maximum tire pressure for tires, explains Car Talk. After learning the recommended pressure, it is suggested that drivers check tire pressure on a monthly basis for optimal performance. Tire pressure should be checked when the tires are cold, meaning tires are at air temperature, for the most accurate reading.