Catrin - Exactly why it just seems like part of riding. Plus it gives me a second to inspect my tires.

It may also be that I check my tires often that I am perfectly comfortable running a low pressure. My mountain bike tires still lose about 1 PSI over night, granted on a road bike it is about 5 PSI but I check before I ride. Just part of my routine since I started, seems to be the norm in my area as well.