I usually take the distance and time and calculate the time. It takes me about 17 min to cover my 3mi commute, 10.6 MPH, and about 50 min to cover my 8.5 mi, 10.2 MPH. I have two work sites depending on where I need to go. Not counting stops, I have no idea how fast my average speed is.

Still slower than a car, car saves me about 5 min on the 3mi commute and 15 min on the 8.5 mi commute; but faster than bus at 45 and 55 minutes respectively. Not typo, 5.5 miles longer trip really only takes 10 minutes longer on the bus due to the routing.