Hey don't they run gasoline nowadays?
Fuel Cells? sortof.. many require a reformer to clean out the carbon from things like Natural gas, or Methonal, but when you do that, you finish with Hydrogen (and oxygen from the air, which also should be purified for maximum power, but for most fuel cells, they'll be designed to run on dirty ingredients).
the best would simply to run on Hydrogen.. the problem is storage.
I think the Fuel for the future (which has been suppresed IMHO), is Ethenol - which is just Grain Alcohol!
it certainly would give farmers more money eh? maybe they'd all switch and we'd end up with too little food (not like we have enough to feed the world anways).