Why would you power the front wheels via a gearbox mounted in the rear of the car? Shurely shome mishtake? Is it the battery pack that replaces the rear seats?
Also, quoting energy consumption in miles/kWh is unusual. As a 'figure of merit' for EVs, this is usually expressed in Wh/km (still non-SI, should be kJ/km). For what it's worth, 4.4 miles/kWh is approximately 140 Wh/km which is pretty good.
"Kinetic energy created under braking is also stored in the Mini E’s batteries."
That will be kinetic energy recovered under braking. Any talk of 'creating' energy is very silly, unless BMW have found a way around the first law of thermodynamics.
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