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.
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... =)