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Message: <blockquote data-quote="Roush2568" data-source="post: 2100966" data-attributes="member: 77438">Look up the manufacturers table or call them. It/they will tell you exactly what air pressure to run based on load of your vehicle and what tire you're running.I have never ran over cold 40psi personally even towing a car trailer with a full size dodge truck loaded on the trailer with E rated 35s Toyos RTs. Only thing you're gaining at higher psi is a harsh ride, worn tires, and a tiny bit better mpg.The tired and true chalk test is another option.</blockquote>