Besides the fact that most of these alternative fuels are to REPLACE the current gasoline as well, theres some bacteria/algea that people have been using to create a gas that would run in our current cars:hsugh:
Algea is by far a better choice then corn, but the downside is it will take a few years to grow enough to produce enough to be used for production.
We really need to do what most of South America does and invest in sugarcane/ethnonol based gas.