Hi,
had the same issue that speedometer showed 12-13% to much (showed 112km/h when doing real 100km/h by GPS).
Top speed was exactly 200 km/h by speedometer, this was real 178 km/h, don't recall if this was also possible on Urban mode, but on a track day a Zero SR/S was faster
My '22 Ribelle is since few weeks now on FW 042 after it had a "critical fault" which resulted in immediate shutdowns. Dealer picked the bike up and re-initialised with firmware update.
Now speedometer is off by 6-8%. The weather was not "autobahn-friendly" here in Munich since the upgrade to test real max speed with new FW 042. But I will try if it gets warmer.
For the annoying speedometer offset I installed already several months ago a Motogadget Motoscope Mini speedometer (with magnet and sensor on front wheel, powered by 12v from the USB input). The wheel circumference in the Motoscope setup is so adjusted that the speed is the same as on the GPS. I only drive by the Motoscope and don't look at the Eva's speedometer any longer, and don't have to calculate the real speed permanently resp. don't have to think how fast i can actually go for not speeding.
Jens
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'22 Eva Ribelle