An annoying thing about BMW bikes and their cars is that their speedometers read 3-4mph high. The computer knows the actual speed but because of a German law manufactures calibrate them high (see below).
The digital speedos on my R1200GSAW and R1200RW are about 3.5mph high.
BMW cars can easily be coded to show the actual speed. I would love to see this coding option in the GS911 software.
"European law (ECE-R39) says speedometers cannot show speeds less than the actual speed, and they must never show more than the 110 per cent of actual speed plus 4 km/h. So, under those rules, a car could be moving at 100 km/h, but the speedometer could legally display as high as 114 km/h."