I like the first reader comment in the first link:
Quote:
Geoff Brown January 19, 2020 At 8:28 am
The accuracy and resolution of a chassis dyno are way below that required to make this in any way a meaningful test.
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The slightly lower or higher readings could be due to tire temperature or other variables as much as engine temperature. I just assume octane rating has essentially no effect on power as long as there's no detonation.