Maintaining proper air pressure is the one of the most important things motorists can do for their tires. In the space of just one month, a tire can lose 10 pounds (psi) of air pressure.
Tire pressures should only be checked when they are cold. Your vehicle’s recommended tire pressures are located on a placard usually on the inside edge of the driver’s door.
Overinflated tires . . .
When a tire is over inflated, the centre of the tread bears most of the load and wears out faster than the outside edges. Uneven wear reduces the useful life of a tire