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I heard from a guy who test bike tires that after you go higher than certain pressure the tires start to lose contact to ground and begind to bounce. That eats energy and gives worse mileage. Now that is in a bike and there is no suspension at race bike (human powered)
In a car there is a suspension, but depending in what shape and setup it has same effects might become reality also in cars. Those differences are very small in the results so it would need more tests and there are so many variables that you cannot say for sure that effects are the same in other tire make or model.
That is sure to all car tires that RR becomes better with reasonable high tire pressures.
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