501, wow. What did Tyler Farrar average then? It would be cool to see some actual curves from prolog.
Also, what was average advantage of using new PT disc wheel vs say 404 with PT like in the last year prolog?
I've heard that at some RPM/power loads precision of power meters varies. Is there such research available for power tap? I would expect some bigger variation for PT because of measuring on the wheel.

Allen,
Just out of curiousity, but what value for rolling resistance do you use in your model? How do you account for the different tires on the equipment? Differences there could easily swamp you +/- 10W range. Thanks!