Don't you all have to stop at stop lights and signs? Don't you have to slow significantly at mup trail intersections and ride more slowly on the trails themselves?

If you have more than a handful of stops and slows in any given ride (and I'm sure most of us do), this is going to lower your average speed significantly.

Heck, the computer is activated just wheeling the bike out of the house onto the street and back again.

Once you factor in all of the stops and slows, you figure your "true" average is at least 1 mph slower, or more.