I'm actually confused as to why so many folks are surprised by this. I've been following cars for 45 years and virtually every car made for as long as I've been following them has been high. Years ago most of the magazine road tests actually showed the speedometer error. It's always been 2-3 mph high. So are motorcycles btw.
GONE: 2012 BMW 550 M-Sport
2016 Audi A7 Prestige
2016 Lexus GX 460---Wife's car
Bikes...2015 BMW 1600 GT---2016 BMW S1000R---2012 Ducati Panigale