Interesting thought. I am so waiting for for someone, almost certainly Toyota, to come out with a plug-in car that I can drive back and forth to work w/o using the ICE at all. Plug in hybrids will let people drive their Hummer and be green too. But it would be a travesty to end up wasting 30 or 40 gallons of fuel. Clett's right, they will have to come up with a more durable fuel.