I did our Saturday hammerfest, which had speeds up to 30 mph and my power numbers overall were a lot lower. So there is some issue I need to figure out. I calibrated again before this ride and got a calibration number only one digit lower than yesterday and still within the range Stages said to expect. Comparing a few segments for previous ride where my time was about the same was inconclusive. Some numbers were higher; some were lower. But group rides can't be a good comparisons.