CARS OF THE FUTURE PRESENT
'(<a href="http://www.j-archive.com/media/2011-05-20_DJ_26.jpg" target="_blank">Jimmy of the Clue Crew reports from the Argonne National Laboratory in Chicago, IL.</a>)  In theory, an omnivorous engine can run on any fuel combination; this one adds butanol, which would result in fewer fill-ups as it's high in energy density, to the common mix of gas & this alcohol'
ethanol