My guess is they were up a few in the rear cassette and then dropped on the descents. I should have used one of my laptimers from my track days to get avg and max speed, but we were close to if not over 50 on some sections. Hills were I had topped the day before on the olympic at just over 40, they were 50+, and I know that speed is accurate since I have a “yellow box” installed on that bike and I calibrated that speedo by GPS.
This year I hope to have a little bit better weather so I can take some more of it in. Last year was a little wet, and since I am riding on or around the center line, that is the slickest part of the road and can be like ice, especially the first hour of rain. So between having the official bouncing around on the back, the sloppy roads, traffic, watching for road debris, a lot of focus and concentration going on, most importantly trying to make sure I was not in their way, or I had room to move if one or more of them had an issue and weaved in front of me.