MG Marvel R: Wrong range and consumption

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/add-a-vehicle/mg-marvel-r-wrong-range-and-consumption/
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I am always using live data via an USB dongle.
When I am planning an doing a trip with abrp, the calculated range is way too short and the first charging stop is placed too early. The registrated consumption of the car is registered way too low. (e.g. 158 wh/km, real is 288 wh/km).
When I am doing a trip now, I don't use calibrated consumption at 110km/h. I always set a way lower consumption to compensate the failure. (eg. 185 wh/km instead of real 207 wh/km).
When I tried to figure out what could be wrong, I found out that abrp is possibly using a wrong battery size for the MG Marvel R. Most websites are listing the car with 65 kWh. But all Marvel R do have 69,9 usable battery size, with a not usable top buffer of 4 kWh.
Possibly that's the reason why all calculations are wrong.
Best regards, Axel