Chrysler during the 1960's demonstrated a car that would run on almost any liquid that contained some hydrocarbons.........motor oil, hair tonic, perfume, cooking oil, terpintine, etc........it had a turbine for an engine........but it quietly died........i guess because of big oil............

it would be fantastic if the on-board computer could analize the fuel in the tank and adjust the engine controls to operate efficently on that fuel...........naturally there would be only certain fuels that thevehicle could use.......but it would make refuling a lot easier if one could have choices while driving to be able to fill up witrh what's available.