Consumption of electricity is of course depending on the distance you drive. Normally the consumption will be stated in kWh/100km.
Watch this video to learn about consumption:
A typical figure would be 14 kWh/100km meaning that you can go 100km on a charge of 14 kWh drawn from the wall outlet.
However consumption is also very much dependent on the way you drive.
Figure 3: The difference in consumption between two driving styles (NEDC and SORDS)
Depending on your personal drive style you should however expect about 20 % higher consumption as an average.
Figure 4 Simulation data shows how the SORDS effectively double consumption compared to NEDC due to higher speeds and firmer braking. Regeneration plays a much larger role in SORDS.
Figure 5: Examples of EV versus ICE energy consumption dependent on drive pattern
The consumption figure includes the energy needed for driving and the charging losses under ideal conditions. If your car is left for longer periods with the charging cord attached, or if you use pre heating or precooling of the cabin the consumption could be up to 60 % higher than the stated value.
You may find it confusing that the in-car trip computer will calculate a different figure which is about 10 % lower than the wall outlet figure. That happens because the trip computer only calculates consumption from the battery and does not include the charger, standby losses and preheating/precooling.
Americans will state consumption as MPGequivalent.
Real world consumption data can be found at www.spritmonitor.de.