My trunk sticker or the psi on the tire? The tires are not stock that came with the car.
The tire pressure on the car's label is the recommended tire pressure for your vehicle. It has been calculate by the GVW of the vehicle and the rated tire capacity to give you the best chances of prolonging the lifespan of your tires. But if the sticker is missing, then go by the tire.
If the wheels are the stock width I've always had good luck adding the *maximum tire pressure and the *manufactures sticker and dividing the two pressures in half. Try the divided pressure. It really works nice if you inflate the tires with nitrogen. They will not gain as much pressure when hot or loose as much when cold.
Go by the trunk sticker. The pressure on the tire is only the maximum pressure the tire is rated for. Auto manufacturers do not make their own tires. They design a car and compare appropriate tires from big name tire companies like Goodyear, Michelin, BF Goodrich etc, and simply buy and throw their tires on their cars. Auto manufacturers determine the appropriate tire pressure for safety, fuel economy, and maximum tire life for their vehicles, so its best to go by what they say.
Tires. Your tires are not stock, so you have to go by its' min and max psi. Any good mechanic will tell you that you should always go by tire's recommended psi. The tire manufecturer have done testing on their tires and have stated the proper psi on their tires (they know best what psi is proper for THEIR tires!) Go ahead people, give me thumbs down lol
