I don't know how accurate the mileage is on those bikes, but if it is accurate I averaged better than 20 mph. I was completely soaked with sweat like I had been swimming by the time I was done. GROSS!
26.6 miles cycling on a beautiful 78 degree afternoon with clear skies and just a slight breeze. At the 25 mile mark (the distance I have to go for the triathlon) I was at 1:16:30. It was an extremely hilly course and my legs were tired from the 2 other 25 mile stationary bike rides this week, so I was happy with that effort.