They might overpressure at the dealer to prevent the rubber from deforming permanently when the car sits on the lot. The 'rounder' the tire is, the better off it will be. Plus, they don't know when they will touch the car, or for how long it will just sit there, so they probably overpressure it so that it doesn't go flat on the lot. My dad tends to overpressure the tires on our cars when we leave them. That and hook them to trickle chargers.
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