Ive always tried to play around with psi's and my best result was 25psi on the passenger side tire, and 27 on drivers side. Good Ol' Peg-Leg. Ran 14.97 @ 90mph w/ 27psi
On the street I was normally doing 50' And I had an odd wear pattern. They were over-inflated and only the center ballooned out.
I would start @ 30psi, and work your way down untill the point where you loose time.
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