In the technical forum, both Jess and I have done GPS comparisons of our speedometers vs actual speed as verified by GPS. I realize that either of us could be off a little, so I'm not holding too much to the accuracy until I can get two scoots together, two GPS mounted on them, and then a passenger to take better readings. But until then, what we have is what we have.
I've made a chart and table showing both scoots overlapped. Curiously, Jess's starts further off than mine, but gets closer the faster he goes.
Has anyone else done this, and if so, how about adding to the data. Find a nice deserted flat location, hold a steady speed (it takes a couple seconds for the GPS to average out) and fill the chart out on the spot. Take a couple runs to verify your reading, and if possible, add a navigator to help.
Jess, I'm running about 4 pounds more air in my tires than recommended, which will ever so slightly add to the rolling radius. How about you?