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The door card on my M6 Coupe shows 32psi all round with the stock 265/35r20 and 295/30r20 setup.
So I’d say 34-36psi would be in the ball park. As yours is a GC it will be a bit heavier plus you have one size smaller tyres.
If Flying Ace is about he could confirm what his GC says, I’d expect it to be slightly higher on his car.
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