Power on 91 octane vs. 93

[Stang 19]

Curious if anyone knows how much of the advertised 760 HP ( on 93) is lost when running on 91? We’re putting some octane booster in the 91 tank provide enough anti-knock to keep the computer and knock sensors happy?

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[Cory S]

I use this rule of thumb. For every octane number increase, you can usually increase spark advance by .75-1°, in which is around 10-13whp conservatively ...... YMMV.....