I have a friend who owns a bike shop in RI (Castors) and he just completed a group ride across the states: Pacific coast to Atlantic, 26 days in a row. Everyone was on road bikes except for one guy on a fixed gear. I obviously wasn't there for any part of it but his comment about the guy on the fixie (sorry, I don't have his name at the moment), was something along the lines of - at the end of the day we were all beat, but he looked he rode every mile twice.