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u always go by the door jam. 30-35 is somewhat norm. i've seen upper 30's too. but 40+ is overpressure.
effects of boosting tire pressure is it can support more if you have a alot of payload. like if yer going fully loaded in your minivan on a road trip. it also decreases the contact patch and thus your rolling resistance since there's less contact patch to friction. this goes wonders for your straight line gas mileage, but messes with your braking distance. side effect is that your center tread wears but your sidewalls don't wear as much
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