MAX is a high efficiency (over 90 mpg) low cost (under $9000) home built sports car. Suitable fuels include diesel, biodiesel, and straight vegetable oil.
You can make your own MAX with free plans from kineticvehicles.com
I'm a notorious designer of small footprint devices--vehicles, aircraft, and equipment--that use a minimum of resources. Neither optimist nor pessimist, I see a half-full glass as a waste of glass.