Originally Posted by khutch

You can see a good discussion of tire pressure and weight in this article. More pressure does mean less rolling resistance because it reduces the tire sidewall flex where most of the rolling resistance comes from. You will get a harsher ride at a pressure too high for your weight and the handling/grip of the tire will be worse when it carries more pressure than your weight requires. The amount of change in resistance and handling from the "correct" pressure is small, the claim is that the gain in comfort is large when the pressure is correct. A correctly inflated tire may even have less rolling resistance on rough roads. The bottom line is that you are doing nothing wrong, a whole lot of people run their tires at the max sidewall pressure regardless of their weight and more than a few run overpressure. If you are happy running your tires where you are then there is no great need to change. You might find that pressures more in line with what that article suggests will be better, but if not what you are doing is fine.

Ken