I Just came back from a 2800 mile trip & had my GPS on all the way @ 50 MPH the GPS said 48, @ 60 it said 55MPH, And when I was @ 80 the GPS read 75MPH.. I used the GPS for real MPH not the Speedo.

 

I thought I was the only one . At 80 on the speedo I am actually doing 72 . . It works for me though that way I don't speed .

 

I guess I'm the only one backwards. Riding with some friends, they were doing 65, my speedo says 58 roughly.