One of many scams, and this particular one, it's been around forever, it seems.
snopes.com: Acetone Improves Gas Mileage
Although acetone will work in the Flux Capacitor. 
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Driving on down the road in my 2001 CVT, going "Boogety Boogety" ...and until avatars are provided, my car looks just like the original silver Insight on the header, above... =)
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