Anyone remember when Smokey Unick took that 2.2 liter Dodge Omni and basically built a ceramic motor for it about 15 years ago? He got 45 city and 50+ highway by supeheating the gas. It made 340+ horspower and had just got it to daily driver status when Chrysler cancelled the project, took the car and ended funding. The average car uses about 3-4% of the energy in every drop of fuel for propulsion and he was up to like 30%. Virtually no radiator and plastic exhaust.
It was published in Popular Mechanics or Popular Science.
Mikey