Inaccurate tire pressure can cause poor gas mileage, uneven tire wear, or a tire blow-out. To prevent these events from happening it is important to maintain proper tire pressure.

If your vehicle's tires are under inflated, it could lead to performance issues and ultimately tire failure. The tire's tread life could be reduced by as much as 25% and cause a reduction in fuel economy of up to 5%. You would find a significant loss of steering precision and cornering stability.

If your tires are over inflated, they could be damaged more easily when running over pot holes or debris in the road. Higher inflated tires cannot isolate road irregularities well causing them to ride harsher. However, higher inflation pressures usually provide an improvement in steering response and cornering stability…up to a point.

Considering the effects of time and temperature, it is easy to understand why a tire's inflation pressure should be checked frequently. For all vehicles produced since 1968, the original tires sizes and recommended inflation pressures (including the spare) are listed on a vehicle placard. In Ford Vehicles, this placard is located on the rear passenger door or door jamb.