I saw a video on youtube featuring a guy (he made the video himself) that claims by adding a half litre of acetone, 99.9 pure acetone, you can increase fuel mileage by as much as 3-5 MPG??? I don't recall the title, nor can I find the link. Any Credibility to this?

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2002 E430 4matic (212,000km)
2002 ML500 'sport'

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