Combination of fuel energy density and motor efficiency. Electric motors in vehicles are close to (some exceed) 95% efficiency. Gas engines are lucky to make 35%. So electric motors are way better at turning fuel into motion (rather than heat and noise).
And they need to be. To store the energy in 1 litre of petrol requires almost 10kWh of battery. Those 24kWh nissan leafs manage to go ~80 miles on the equivalent of about 2L of petrol.
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