It starts off with " Traditional gas engines operate at 8 to 10 percent, efficiency, while the engine on the Mustang, he said, is at 38 percent efficiency."

Well, typical efficiencies are 20%, not 10%. 38% represents about the maximum possible in a gasoline engine. That does not equate to 100 mpg. A tuned F1 engine is about 37% efficient.

Fators of 4-5x are not possible IMO using gas and/or alcohol................

I give this one my BS flag.

Kitz