It's been tried and reported forever and is absolute nonsense. Those who report mileage increases are driving more carefully. The only way it'll help is if timing is advanced to the extent that a higher octane will delay ignition and improve burn. Even if that's a problem, the percentage of acetone people are suggesting isn't enough to notice.
Desperation is breeding some real gems these days.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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