All tires lose air, so checking your tires monthly is an essential piece of basic car maintenance. Always use the same tire pressure gauge and check the air pressure first thing in the morning, not after you’ve driven on them or they’ve been sitting in the hot sun. Inflate to the pressures listed on the carmaker’s decal (on the driver’s door or jamb), NOT the maximum pressure listed on the tire. The recommended tire pressure is based on the weight of your particular vehicle, not the tire brand or tread style. Regular maintenance makes tires last longer.