Baring a major break through in EV's I think I'll wait until hydrogen cars come along.
I read recently about a gentleman that had developed a new way of turning water into HHO gas that made the process much more efficient. He had built his own portable blow torch cutter thingy-ma-jig that was water powered and then he coverted his car to run on it too. He uses something like 5 ounces of water for a 100 mile trip. It's all been tested and verified and doesn't seem to be a scam and now he is currently in negotiations with US car makers and is even working with the US military to develop a water powered Hummer.
Of course it probably wont be for another 20 years until these things are available to the public but since I probably wont be able to afford another car for that long anyway I can wait!
Cheers,
PKFFW