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You are right about the test vehicles not all being electric vehicles. Also the car in the pictures earlier in this thread has a german licenceplate without a E in the end, which also suggests that it is not a electric vehicle.
It would however also be possible that they test the new dash also in non-electric vehicles just for testing purposes of the new systems, in order to get as much testing hours as possible. If they do not plan on changing the dashboard for the G20 LCI it is not needed to test the old dashboard version, so why not just also use these cars for testing of the new iDrive 8 dash ?
I do however still think that it does not make any sense to now release the 4 series GC with the old dash while the i4 has the new dash, and then a mere couple of months later put the new dash in the LCI G20, and not introducing it now on the 4 series GC
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