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The water-injection system for your carburetor that the oil companies don't want you to know about! -- paraphrase of an actual Popular Mechanics ad circa 1978

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Joke's (partly) on you: https://en.wikipedia.org/wiki/Water_injection_(engine)

Oh, it's been proven to work, even in a limited number of production vehicles. Just not with what you buy out of the back of a magazine. :-)

I later in life learned that the “test cards - all channels” ads I saw in the back of the library’s Popular Science in the 90s probably weren’t scams.

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