If I could just comment on that, there are a lot of different options out there. Firstly, every one of them is very expensive. There are a lot of people writing about ethanol now, a corn-based ethanol. You'd have to transfer almost every acre of ground in North America to producing corn to get anywhere near what you'd need for the E85, and then you'd have to put billions of dollars into an infrastructure to make it work.
So putting money into alternative fuels is one way, but the best way is to require the current system to improve fuel efficiency over an established period of time, no matter what you're using--gasoline, E85, or any other--and have each vehicle meet an improved standard, not just the larger vehicles or the smaller, but everybody.