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).
The idea is to allow consumers to compare the energy consumption of EVs or Electric-Hybrid models such as the Leaf and the Volt to those of gasoline or diesel powered vehicles in terms of miles per gallon.
Knowing that many consumers are still baffled by the concept, General Motors released a short video where it tries to explain the new EPA ratings on the Chevrolet Volt. Scroll down to watch the clip.