I've got a nice commercial air compressor in my garage left over from my days as a contractor. I keep the hose pressurized all the time to around 95 psi, the same pressure, coincidentally, that my I run my 700c x 32's. With the presta to shrader adapter I keep handy, all I have to do to is hook it up, let the pressure in the hose equalize with the pressure in the tire, and I've got almost instant 95 psi in my tires. When I inflate fat mtb tires, I've got to be a little more careful of course. As for a gas station pump, I agree that they're most likely kept around 90 psi, which is close to normal operating pressure for most air compressor applications. But since you don't know for sure what the pressure is, be careful, and be aware that with lower pressure tires, especially, the danger is that air compressors inflate with such a high volume of air, very quickly, that you could grossly overinflate a bicycle tire within a few seconds.
Last edited by well biked; 06-23-06 at 09:13 AM.