Quote Originally Posted by Pedal Wench View Post
I only use averages to compare to myself on the exact same route. Last year was X, this year X+2. What you can do is use that 10mph average as a starting point, and try to improve that, and only compare that number (if you must) to other people doing the same route under the same conditions.
+1
and realize that you will mostly only see the larger changes in your fitness by watching average speed. Small increments get lost in differences in the wind/weather, if you need to slow down for one more red light/turning car etc., how intense the workout you did the day before was and the zillion other things that make every ride different from the last.