The door jam specs will only be accurate if you have stock size tires. I would take the recomended max pressure (40psi in your case) and come back a little. For comfort I would go for 38psi. If you are going for performance, you would just have to try what Kevin suggested and experiment. Try 35psi up front and 31 in the rear, that should be about right.
Exactly what tires are you running? (Size, Brand, Model)
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