That brings up another good point. Average speed can be very deceptive depending on how it is measured. My average speed on my MTB was 12 to 13 MPH but I only averaged about 8 miles a day on my morning ride, now my average is closer to 17 MPH but I am doing 15 miles in the same time. How is this? My average speed was calculated on my moving time not my overall time, and I take fewer brakes now also. Previously on a 1 hour ride I would have a moving time around 40 to 45 minutes, now I'm moving for 54 minutes out of that hour. So I guess If I rode like the hare from the Tortoise and the Hare I could have a higher average speed on my MTB but cover less ground over a given time period.