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You cannot say that an electric car gets 78mpg. That is just for hype and sales.
Lets say the car runs full electric under 50kph. The batteries last for say 100km. If you drive less then 100km both ways to work, you are getting *mpg because you are never going to use fuel. If you drive 120kph, to work and back, you are driving 20km on petrol.
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