Well I'm new to this so don't have too much to add, but yesterday's race was pretty fast paced, it was surprisingly dry and there was a long, flat, hard packed stretch off the back that let you get into your upper gears (let's say 46/14 or so). I don't know at what speed drafting starts really working and for how long you need to benefit, but I got myself too far behind the lead pack on the first lap to catch up to the tail end and I was riding by myself, or least I thought I was until I looked over my shoulder I realized this other guy was sucking my wheel the whole stretch! He passed me on the first turn at the end of the stretch. I'm sure he would have passed me eventually anyways, but he decided to go ahead a suck my wheel for a minute or so before making his move.