The ACES IV (formerly sold as TK-7 by the company that originally developed it) stuff is most beneficial as a cylinder lubricant to reduce ring & bore wear.

I've got a copy of the original test done by David Vizard on TK-7 and the "effective" octane increase as he described it was very low under conditions that duplicate normal street usage. The scenario when the "effective" octane increase showed up most was with low water temps, controlled induction temp, etc., that are more representative of something like a track-only drag car would experience.

I've taken exception to how BND markets this stuff as an octane booster for this very reason, although I do use it for the top-end lubrication benefits.