FWIW: I don't have a scangauge. However I did try Acetone in ABA test. I didn't go any further because I ran the B level over 3-4 tanks of gas. I ran 3-4 tanks of gas, I didn't see any substantial improvement, to a level where it wasn't worth fiddling with, twice.
The way I look at it is maybe it works for some people. It didn't work for me, but if someone thinks it might, then they should give it a try, in their car. If it works for them, then I would say it seems to work for them and they should go ahead and use it, if they wish.
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