[miket]

Double Sigh! It's not usefull since it doesn't accurately compare the direct cost of buying the energy, the environmental cost, security cost the storage cost. Its just a useless marketing gimmick.

edit:The energy used only inside the car doest matter to anyone so why bother converting that? Mpge could have been much more usefull, though because of the apples to bread stick comparisons there would have to be many different Mpge conversions for accuracy in different situations. They basically picked the only conversion no one would care about.