My Garmin data from the 6-hour event can be viewed here: http://connect.garmin.com/activity/117018873
Note the 5300 feet of climbing. The steepest grade I encountered was 11%. This was a tough course, with rough roads. Some of the downhill runs were spoiled by an intersection or a dangerous "bridge bump" that forced everyone (with sense) to shed speed a few times each lap. Nevertheless, my first lap average speed was 22.2 mph. The current "1-lap" recumbent course record was set in 2010 by Greg Gross, with a time of 1:13:40 for an average speed of 21.6 mph. My first-lap time of 1:11:34 will not replace this record because I didn't enter the 1-lap event, but lap times are recorded and avaiable for comparison.
My Garmin Edge also records the temperature, and you can see it reached a brain-frying, leg-cramping 107F in the afternoon. Without that incredible heat, I think afternoon speeds would have been much faster. I really have to give a lot of credit to our crew who not only got our equipment in place and ready to use, but kept us cool and hydrated as much as possible. Thanks to Doug Burton, Rob Redfearn, and Will Parker.