VIDEO: Chevrolet Tries to Explain the Volt's MPG Equivalent and MPG Ratings

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