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Probably 30 or so?
Do this.
Fill the tires with 34psi. Take a piece of chalk and draw a line accross the tread. Drive around on a dry day a little bit, and then check the line. If the center is worn out, drop the psi. If the sides are worn out, raise it a little until you get even chalk line wear. From that point, subtract a few psi or so for street traction but not too much.
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