The official "my Yaris handles bad on the highway/with crosswinds" thread

[blacksan]

Originally Posted by grampi

Not true. As long as you stay under the max pressure listed on the sidewall, you'll suffer no ill-effects (with the exception of a stiffer ride, of course). Tires are made to hold their shape up to the max pressure regardless of vehicle weight. According to every tire expert I've talked to, running with the pressure listed on the driver's door plus 5 PSI is optimum for traction, handling, max tread life, and lowest road noise. The only benefit to running right at the recommended pressure is a smoother ride, but then everything else suffers.

http://www.thedieselstop.com/content...re%20Inflation