My front tires are rated at 45 max, and I run them at 55 psi. It feels really responsive with the rack & pinion steering. The rear tires I keep at 50 psi, they're different tires and rated a little lower for max pressure, can't remember exactly what they're rated for.
The car gets great roll at these psi's, but if it's wet outside I pretty much just creep it around since there's a better chance at hydroplaning at those pressures
I haven't noticed any funky tread wear from the higher psi, but I definitely feel every bump in the road!
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