Tried to ride farther by stepping up the tempo for 1.5 to 3 minutes at a time for the second half of the workout. Still, my distance at the end of 30 minutes was exactly the same as last time. It was an upright bike as opposed to a recumbent bike I had used previously. Still, I'm guessing that they measure distance as a function of time pedaling rather than RPM.

Anyway, I made it a few extra miles by riding through the five minute cooldown at the end.