The world needs a new source of energy, an unspillable source.

how can i convert my car to run on biofuel?

I want to convert my car to run on anything better than gasoline. what is the most inexpensive way to do so, what is the best biofuel, and is there anything i can use as fuel (besides gas) without making any changes to my car? Finally, are there any websites that have info about this?