@Butcher,
Though I didn't ride a tandem, my 1 day STP experience was similar. I made (for me) record time to the 1/2 way point in Centralia. At that point I was way ahead of schedule, though things slowed down later that afternoon. My full report (posted in some other forums):
http://www.yunt.net/blog/?p=388
I love finding big guys on tandems to draft behind - keep it up
