If you're getting that indicated vs actual difference at freeway speeds I'd say it's normal. In Europe (or maybe just Germany specifically) there's an allowable speedometer error, but it's can't at all indicate high with big penalties if it does. So most German cars have intentionally optimistic speedometers. The odometer will be accurate though.
You can actually use the Carly app to make the speedometer accurate. The only downside is the little bug that shows where the cruise control is set will still move to the old inaccurate position so it'll look like the cruise control isn't hitting the set speed.
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