Good commute in to work this AM. Covered 13.4 miles in 51 minutes on my rigid MTB with slicks (average 15 MPH). This is the mostly uphill part of my commute, going home I can average 18 MPH.
Had a funny comment from a pedestrian who was walking her daughters across the street to get on the bus:
"You're going faster than a car!"
Not in a nasty way, just an observation. Made me smile.
Full disclaimer: I was at the bottom of the biggest downhill on my route in