If a gas engine will run on wood smoke, the idea that it would run on vaporized gas doesn't seem far-fetched. http://www.robertsarmory.com/gas.htm
I heard some rumours over the past several decades and I did wonder if the vaporization of gasoline was the factor that might well explain some high mileage carborateurs that supposedly were found here in Nova Scotia and also New Brunswick, Canada.
I think it's funny that since some cars now DO get 100mpg, the kooks now have to say 200mpg to make a splash.