Re using the tyre pressure placard rather than the tyre dealer's recommendation. My daughter is about to do a defensive driving course and they insist the tyre pressure should be 40psi so what are your thoughts? They don't even know which car she will be driving, which is a 2011 Toyota Corolla.
Higher pressures are used for such courses because she will be doing extreme exercises and the higher pressures mean better grip while minimising tyre wear.