Once upon a drive, all we had to know about a car's fuel consumption was how many miles the vehicle could travel on a single gallon of gas in the city, on the highway and on a combined route, regardless of whether the engine was fed with petrol or diesel.
Nowadays, the appearance of all-electric and extended range hybrid electric cars in showrooms has forced [ahem...] the U.S. Environmental Protection Agency (EPA) to embrace a new method to measure the energy consumption of alternative fuel vehicles called MPGe (Miles Per Gallon Equivalent).
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