[gxgman]

I have a 1997 accord EX with stock wheels and tire size. I have done a some experimenting with tire sizes and pressure. I lost an expensive set of tires (and several other average sets) to underinflation by following the recommended tire pressure. I found that 38psi cold provides the most even tire wear, so that is what I use. This is with 50% or higher freeway driving.
I haven't done much street driving until now, but I think adding any more than 2psi to this would be way too much. Small changes make a big difference. Of course, this is only with the stock wheels and suspension on my car. I don't think there is a set tire pressure for a set size. Too many factors effect tire wear and traction. It may be a matter of trial and error to find out what works best for your specific car, tire brand & size, driving habits, speed, etc.
Hope this helps.