Future Fuels

Hey all, Im currently writing a paper on the possible future fuels in cars as part of my degree. I am curious to see what everyone here thinks will be the best possible fuel for cars in 20 years time.

All ideas are wellcome.

Thanks alot.
Racos

food, once we have advanced sufficiently in the sciences of stem cells and gentic research, we will build a stomach similar to that of a crocodile with the other neccesary organs that is connected to an electric motor getting its fuel from various food sources, farther down the road we will have engineered the stomach so as to generate its energy from garbage.

Interesting Idea, I aint hear that one before, but yeh I dont see why it wouldnt work...intergrating biological components into a car...