Some current forms of alternative automotive fuel energies that are used include biodiesel, ethanol, hydrogen, and electricity (in hybrid autos). Define each form and discuss which one(or another form of energy) that you think will have the best chance to become the next standard form of automobile fuel energy when petroleum becomes too scarce and/or too expensive. Be sure to provide reasons to back up your choice.

What do you think it would cost for a small country to replace petroleum with biodiesel? how long would this process take?

How does biodiesel’s viscosity compare to petroleum-based fuels? Also, why is viscosity a factor to consider for fuels?