Love the car - but 30 miles on EV?

[anko]

This kind a matches my findings that I am generally not able to get in more than 8.4 kWh.

Hi,
On the two occasions I depleted the battery and remembered to check the power meter before and after charging, the car took 12.2KWh both times. This is via the standard 13A supplied charger.
Since the battery can only use a little under 8KWh before being depleted does this mean that my battery is defective (although range in summer is 26-28 miles) and takes more power to charge than it should or does it mean that the Mitsubishi charging system is extremely inefficient?
Kind regards,
Mark

8.4 is very little, but 12.2 would be very much. 12 kW * 74% = 8.9 kWh usable. With 5% losses, you should be able to draw no more than 9.3 kW.