Generally speaking, a tire will lose one or two pounds of air per month in cool weather, and even more in warmer weather. Un derinflation is the leading cause of tire failure, so check inflation pressure regularly. It is normal for pressures to build up as a result of driving. Make sure all tire valves and extensions are equipped with valve caps with rubber gaskets to keep out dirt and moisture. Have a new valve stem assembly installed whenever a tire is replaced.
Proper inflation extends tire life and saves fuel.
Maintain the inflation pressure listed in the vehicle owner's manual or on the tire placard . In addition to showing the vehicle manufacturer's recommended cold inflation pressure, the tire placard also shows the maximum load of the vehicle. Do not overload your vehicle. Remember, baggage carried on top of any vehicle counts as additional load. If you are towing a trailer, remember that some of the weight of the loaded trailer transfers to the towing vehicle.