Well, now we have a more objective measure on which to base any automaker's claim. We could similarly put GM's Volt and Nissan's Leaf through the same Progressive Insurance Automotive X PRIZE test protocol and compare MPGe, which factors in all energy sources used to move the vehicle, with MPG, which only factors in gasoline energy. We make the case that MPGe should be the standard on which to compare efficiencies of thenext generation of cars that use a variety of fuels and energy sources.