In the last mile at the end of a 13 minute/ 5.3 mile TT we used to have here in Northern MN, I've probably done 26-27mph. I could probably crack 2 minutes With one swing at a mile on a smooth highway with passing cars and no wind. I'm middle of the road ability wise, cat. 3 road racer. My best time for that course was 12:55 in a 2 man TT, but I dropped my partner after a couple miles... Too bad... Our local cat. 1 could do about 12:15 for his best effort, 11:58 once...