2012 Jeep Patriot Owner Manual - Page 350

348 STARTING AND OPERATING CAUTION! After inspecting or adjusting the tire pressure, always reinstall the valve stem cap. This will prevent moisture and dirt from entering the valve stem, which could damage the valve stem. Tire pressures change by approximately 1 psi (7 kPa) per 12°F (7°C) of air temperature change. Keep this in mind when checking tire pressure inside a garage, especially in the Winter. Example: If garage temperature = 68°F (20°C) and the outside temperature = 32°F (0°C) then the cold tire inflation pressure should be increased by 3 psi (21 kPa), Inflation pressures specified on the tire pressure label are which equals 1 psi (7 kPa) for every 12°F (7°C) for this always "cold tire inflation pressure." Cold tire inflation outside temperature condition. pressure is defined as the tire pressure after the vehicle has not been driven for at least three hours or driven less Tire pressure may increase from 2 to 6 psi (13 to 40 kPa) than 1 mile (1.6 km) after a three hour period. The cold during operation. Do not reduce this normal pressure tire inflation pressure must not exceed the maximum build up or your tire pressure will be too low. inflation pressure molded into the tire sidewall. Check tire pressures more often if subject to a wide range of outdoor temperatures as tire pressures vary with temperature changes.