Daniel,
While any way you want cut the issue, it still has be economical in the end. A switch to ethanol isnt worth the efforts if it takes as much fossil fuels to process the ethanol as it would save by burning it.
Also, it must be cheaper than gasoline. Which considering what it is and how much captial it takes to get the oil, oil is quite cheap as a substance.

So really, that will leave us with hydrogen. Unless there is something else on the horizon I dont know about. Which converting to will be quite expensive for everyone, and we need to come up with a viable and inexpensive source of the hydrogen. Natural gas is the most likely source unless we find something else.
Of which there is 35trillion cubic square feet of natural gas on the Alaska north slope just waiting for a transportation method to market.

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