Between 1928 and 1935, Charles Nelson Pogue, an inventor from Canada, applied for numerous patents for what he claimed was a new type of carburetor that supposedly completely vaporized gasoline before introducing it to the cylinders, thereby extracting a great deal more energy from the fuel.
The Pogue carburetor was touted as getting 200+ miles to the gallon.
See the full story at http://www.snopes.com/autos/business/carburetor.asp
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