Well, after the 1200+ mile weekend, I found that Honda finally made a speedometer that is dead on. There is a digital readout for the cruise control that reads the set point. It reads the speed exactly as my Zumo GPS reads, plus the analog speedometer indicates the exact same speed. I could bump the cruise up or down by 1 MPH and the indicated speed from the Zumo would follow. Not higher, not lower, but the exact same number. Kinda spooky, it's so close.
I also checked the operation of the cruise as low as 25 MPH. Nice when you're crawling through a long school zone or interstate backup.
Ride Safe
John