I have gotten up to 40 once on a long downhill I have in the morning. I generally average about 14 over the 7 miles one way (includes time waiting at lights). I can get another mph on the way home which does not make sense I should be tired and I have that nice long downhill (which is now an uphill). One factor is that I go to work in rush hour traffic and I work usually work late so traffic is much lighter on the way home. When there are fewer cars, I am not having to brake to squeeze between cars and stuff.