Quick search..WHAT so I'm the only person in the world who expect their speedometer to read correctly?
Bottom line is the speedometer is wrong.
Indicated speed vs actual
Forgive me if this subject has already been discussed. Ever since purchasing my 2003 R1150GS Sport, I noticed that it seemed to motor along effortlessly, and it seemed that I wasn't actually moving as fast as the speedometer indicated. Even 70 or 80 mph (indicated) didn't seem that fast. For...
forums.bmwmoa.org
Speedometer vs. GPS Speed Reading
www.driveaccord.net
tl;dr - in vehicle speedometer speed will be slightly higher and done purposely by the manufacturer for rules, regulations, and liability reasons.
thread solved and now closed.