Well, full renewability in transportation is an engineering challenge. Suppose you only have the ability to displace 30 percent of current oil consumption with renewable fuel. Somehow you've got to come up with a way to keep the whole shebang moving. What can be done? I think reducing the weight of vehicles is the most direct route to solving the problem, instead of switching over to more efficient engines like we hear about all the time in the media. I suppose it's disappointing to alot of people that sometimes the solution is boring or doesn't satisfy the ego or people's need for a magical fantasy of the future. Here's a line for ya: "Clever.... the car that will save your soul..." Dub over some ethereal new age music. Does that work for you? It doesn't work for me.