That is, the energy in all the gasoline consumed is about 5,200 billion kilowatt-hours.
So is that how much electricity we need? No! It turns out that electric vehicles are far more energy efficient! A gasoline-powered vehicle does good to average 15% energy efficiency. I know this from taking actual measurements while doing research for my first book. A plug-in electric car, however, can easily maintain 60% energy efficiency. Since the electric car is 4 times as efficient, it only needs 1/4 as much energy to go a mile. That means we can divide the total energy used by a gasoline-powered car to see how much electricity it would need to go the same distance.
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