That's true. Higher than the sidewall max puts you in the safety cushion set by the manufacturer. Realizing that tires heat up as you drive increases pressure is something to keep in mind also. The pressure in my tires has gone up by 5 psi after my 1.5 hour commute so I leave my tires 5 psi below sidewall max as a precaution. I'm leaving my motorcycle tires at the recommended rating though. Fuel efficiency on my bike is good enough for the girls I go out with lol
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