The correct auto-car tire pressure for a vehicle is determined by the size and weight of the automotive vehicle, the type of auto-car tires it uses, load hauled, and the type of automotive driving the vehicle is intended for. The auto vehicle manufacturer places a tire inflation placard in each vehicle that gives the proper car tire inflation pressures for that auto vehicle. This placard is located on the inside of the glove box door, inside the fuel-filler door, or on the car driver?s side doorpost (depending upon manufacturer). Most auto manufacturers also list tire inflation levels in the owner?s manual.