Speedometer is off by around 10%

I paid attention today... at 25mph (using my phone) the speedo showed about 24... at 85mph it showed about 90mph... I've had a Honda, other Triumphs... and a HD that show/showed about the same.
-MIG

at 25mph showed 24 (1 less)
at 85 mph showed 90 ( 5more)
?
 
The speedometer is proportionally offset. That is to say at
50kph it's off by 4kph
60kph off by 4kph
70 kph off by 5kph
80 kph off by 6kph
90 kph off by 7kph
100kph and up is off by 8kph

This is done to avoid any liability by the OEM and there is NO fix. Well one. Ignore it and use a GPS that shows your speed.
 
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