I was considering my general 2011 cycling and fitness goals the other day before discussing them with my trainer and we got in a conversation about average speed on the bike. He warned me to not set my goal overly high because it changes daily based on a lot of things, much of which is out of our control.
I know there are many different ways to calculate average speed, and it changes from day to day. Is it just the actual time on the bike, was drafting involved, presence of strong winds, hills, so many things affect average speed.
My average speed in August, when I rode close to 600 miles, was between 13 and 13.5 or so. It was in mid-September when I developed my injuries so August was the height of my season and fitness. Of course my average speed difference depending on assorted factors, and am curious how others calculate/consider this.