What is the correct tire pressure?
Each vehicle has its own specifications for tire pressure, but most fall between 28 and 36 PSI (pounds per square inch). No, for most cars a tire pressure of 40 psi is too high. You might find 40 psi suitable for some vehicles, especially if they’re carrying heavier loads or if the manufacturer’s recommendation is close to that figure. However, it’s generally too high for most passenger cars, which usually recommend between 30-35 psi.