Bio-diesel has a good chance to become a common fuel in its own right. Ethanol is still energy negative (you expend more BTUs making it than you recover while burning it)and will likely never amount to anything more than an octane booster to replace MBTE. Without the ridiculous subsidies and current import ban, ethanol couldn't survive on its own. Plus, the PC Police have removed ethanol from their list of "All Things Wonderful" and now rank it right up there with Haliburton, simply because all those bags of extra corn we used to ship overseas to feed the indigent are now being made into fuel. It seems that our quest for energy independence isn't all that important, after all. (Not that ethanol alone was going to do that!) Ethanol may be an joke, but if it made economic sense, I'd be far more concerned with Americans driving than non-Americans eating.