[Chris]

My GPS proves the GZ speedometer is quite accurate. Any speed notice should be on the flat with no wind. A rock can go fast downhill behind a truck with a tailwind
But 90mph??? I don't think so.
I just love my GPS because I often cruise way out in the county on the Georgia backroads. I am never lost, of course, but am often confused, as the famous explorer, Kit Carson, used to say. Of course, I don't read the GPS while riding, but to me not having one on rides would be silly. My first one ( a Magellen) recently died, so I just bought my second one, a Garmin.

Chris, Atlanta