i think it is supposed to be in the owner's manual. you can go 4-6 psi over the reccomended pressure without risking your suspension. i ave mine set at 40 psi (185/70/14's) and i can say that the ride is a bit harsh, but the handling is really good. when they say about what you need to use, is because of the weight of the car, weight distribution, suspension setup. hope this helps you.
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