I've always considered 35psi cold to be the standard. or if you wanna be exact, look at the door jamb and follow those guidelines. I have a tire inflator at home so I usually just run that when my tires are cold to 35psi. if you're stopping at a gas station in the middle of a road trip, then I can see it getting tricky. if you go to the tire pressures on your screen, it will tell you the recommended warm tire pressure as well.
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