Yesterday I heard a conspiracy theory that the reason lead was added to gasoline was to keep the Pouge carburetor from becoming viable because it allegedly used pre-heated gas vapor to achieve 100-200mpg efficiency, but the lead clogged it up instead.

Here's my own counter-conspiracy on that... if everything we read says that it didn't actually work, why did Breen Motor Company claim it worked when THEY tried it? And why did Pouge suddenly disappear?