About the calibration of the speedo, I‘ve got a 2018 plus4 (german Model) and the speedo has the same difference.
The difference is exactly 10%. So I drive 77KM/ it‘s real 70KM. I think it‘s wrong all over all MOGs from factory.
On the way home from Britain this year my friend and me want to know what she‘s able to do...
The speedo shows 190 KM/h, the nav says 172. (German Autobahn without speedolimit - clear) So I think the speedo shows the wrong speed all over the dial.
René