The speedo on my 2017 107 was only 1% fast on the dyno wheel. Read 101 at 100 MPH.
All of the previous years were 5-7%. I would usually add about 50 points to the cal number to correct it. This would also slow the odometer down too reducing the fuel milage calc as well. I have had to explain this more than once after dyno tuning bikes and the customers report a slight loss in fuel economy after I slowed their speedo and odometers down by 6%. In theory, with the 2017 odometer being less generous, the fuel economy gap should be even greater between the 8 valve and the Twin Cam if a person was using both odometers uncalibrated to calc the fuel burn.
SG