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I've run 45-50 in my Insight; basically max sidewall with the OEM tires, which are the best for fuel economy. Many run higher, but I've damaged tires twice just running at the pressures I do, and replacement isn't cheap.
Tire pressure really should be proportional to how much load/weight you have on them. My fronts have around 600lbs each over them and my rears have a bit over 300lbs each, but pressure is the same front and back. I could either run smaller/lighter/narrower tires in the rear at the same pressure, larger up front at the same pressure, or significantly inflate the fronts and leave the rears the same.
I have well north of 200hp in a <2000lb car, running 165mm width tires with high pressure, and even if I'm careful my front tires aren't long for this world. I'm going a little wider in the front as a test and keeping the 165's in the rear.
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