The recommended tire pressure for a car can vary depending on the vehicle, tire size, and load requirements. In general, most passenger cars will recommend 30 to 35 psi in the tires when theyre cold. The recommended tire pressure is a cold inflation pressure, which means the pressure check should be done after the vehicle has been sitting in the shade for a while. It is important to note that many vehicles have different tire pressures on the front and rear axle, and it is recommended to check air pressure every other time you stop to fill up your gas tank. Additionally, tires lose or gain 1 psi for every 10℉ change in temperature, so it is recommended to check tire pressure when the tires are cold. It is essential to regularly check and maintain the correct PSI level to maximize tire lifespan and maintain a safe driving experience.