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My rule of thumb is run as little pressure as the tires will tolerate. However it depends on the surface.
High-grip surfaces require more pressure than low-grip. Hoosier A6s require much higher than Kumho V710s. Street tires in general require higher pressure because of their softer sidewalls.
For Kumhos we like 31-32psi front and rear on medium to low-grip asphalt (like Heartland park, FedEx field, etc) and low-grip concrete like Toledo. When we try Hoosiers this year, probably 38psi all around to start due to the weaker sidewalls of the A6.
This on a 2000 S weighing 2900lbs(ish) with 245/35/18 on 7.5" front wheels and 285/30/18 on 9" rear wheels.
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