Just a few figures from my own experience.
Recently got an i3 which is probably one of the more efficient electric cars. In warmer weather acieved about 4.2m/kWh and with temperatures around freezing about 3.8m/kWh. Reduction mainly due to increased battery resistance at cold temperatures and more energy used for car heating.
Biggest inefficiency, which most people tend to forget, is the battery storage efficiency which I calculate is about 80% for this car based on the reported energy used and the amount needed to recharge.
With home charging, rate is restricted to 7kW with a single phase supply. For three phase then rate increases to 22kW. Rapid charge is up to 50kW but this uses DC charge with the AC/DC conversion done in the charging station and not in the car.
Samller battery / range than the Tesla but more affordable and narrow enough to drive up the road to my house.
John.
