OK, so now I'm a little disappointed. The reviews that I've read on this model state that the speedometer is 6% optimistic. The local PD put one of those radar-speed signs down the road from where I live. I went past it on the way home from a ride on my Guzzi, the speedo and the sign agreed dead-on.
So, after I got home, I took the PS250 past the sign. It is 13% optimistic
60 MPH indicated = 53 MPH on the sign. So, the 90 MPH indicated is more like 80 MPH, and not 84. Still respectable, but, I'm a bit pissed the speedo is off so much. No wonder people are still blowing past me when I am doing an indicated 60 MPH on a 50 MPH four lane road. Well, now, at least I know. Next time, I'll do an indicated 69 MPH for my intended 60 MPH (which is the defacto speed on that road).
This speedo error isn't just with this model, or this particular scoot. If you look at the reviews on
www.justgottascoot.com, David GPS checks all the scooters, and 10% or more error is typical, and they all read high. Looks like false marketing to me.