gentlemen, for your replies. Curtis, thank you for your in-depth explanation. I check the pressure before every ride, and only recently have we had cold (30's) temps, and that's when I noticed the pressure drop.
niterider, good observation! I didn't pay much attention to the top of my valve stem cap until I noticed a 2 lb drop overnight. Turned out that as I was trying to get my tire guage on the valve stem, I loosened the threaded part of the valve stem, and the air leaked out. THAT's when I realized why the top of the valve cover was notched. DOH *G*
west chester, PA