Definately not a blanket statement. I've had several occasions where I'll barely gain 1 mpg,(winter gas makes acetone pretty much useless) Then sometimes I'll hit it just right and get 3 to even 5 mpg's, but that's a good stroke of luck, mixture and gas quality. I am not a big proponent or opponent of acetone, all I do is try these things and see what they yield. So far acetone has helped, and in rare occasions, hurt my mileage. (don't overmix!)
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