Gasoline has an energy density of 34.2 megajoules per litre. A 100kWh battery pack contains 360 megajoules of enery. So all the energy contained in a large (when looking at passenger EV vehicles) battery pack is the same as that contained in 10.5 litres of gasoline. A 100kWh battery pack is about the practical limit of size and weight of a battery pack to put in a passenger vehicle and according to google can weigh up to 600kg, which is the same as roughly 800 litres of fuel.
All in all, it’s easier to add more fuel capacity to a vehicle.
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