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Not same tire, but I went through same tire pressure learning curve at NJMP lightning few weeks ago.
Towards the end of the day, I got handle of TP rise from heat and settled on 27psi COLD, 30-32 HOT felt great - not same tire as A7 but suspect it would benefit from lower TP.
37-39 psi was kinda scary how little traction the car had!
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 ing for grip.
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