trials done a few years back on moonshine meth fuels in a British built Triumph sportscar showed excellent potential for performance/economy/emissions.....however, the annual requirement for autogas in the US would exceed the entire worlds' production of the wheat used to produce the fuel.
PS It is said that the dialy requirement of electricity for New York computer monitors is in excess of the entire electrical requirements for Sierra Leone PER YEAR.
It is more a problem with how we use the energy than where it comes from. (?)