Originally Posted by
jeffpoulin
I've been commuting for 20 years and never averaged close to 20mph. I can get my average up to 17 on a good day, but hills, wind, traffic, city streets, and generally riding safely take their toll on average speed. I have no problem cruising at 20mph, but averaging that is wholly different level.
That's what I find I run into as well, but I commute in town. With a rural commute, in my area, there's definitely a chance you could have a 10 mile TT.
I generally cut the speed down more, because it takes 15 minutes of my time to change and 5 minutes to take it easy.