Good litmus test for FE scams.
A gas engine is about 25-30% thermodynamically efficient, meaning 25-30% of the heat energy is converted to mechanical work. If that 318 was even out of tune around 20%, a 9x increase means they are using 180% of the energy of the fuel. Uh-oh.
Any system that appears to have more than 40% efficiency should be ruled out right away. The best systems in the world struggle to attain 50-55% and they have huge economies of scale. A good example:
http://people.bath.ac.uk/ccsshb/12cyl/