Hybricon was a project by engineers Gerald M. Fields and Robert Metzner of North Hollywood, California, who set out during the fuel crises of the 1970s to develop a fuel-efficient hybrid compact car running on both gasoline and electricity. Their car, the Centaur II, was based on the Honda 600 and combined two small electric motors with that car's two-cylinder, air-cooled gasoline engine. The Centaur II reached 70 miles per…