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Tyre pressure is directly related to the weight of the vehicle. 50 PSI in an SUV is safer than 50 PSI in a small hatch back. If you over inflate tyres you will have a smaller contact patch on the road hense the lower rolling resistance. This can create uneven wear, generally in the centre of the tyre, as this is the area with most contact with the road.
I do over inflate by a few PSI, but not much, because I don't want to compromise safety for a 1 or 2 extra mpg.
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