Originally Posted by Jordo!

Basically, if it wasn't running full advance, it would be more likely to do so on higher octane fuel.

And I say "more likely" rather than definitely because other sensor data affects how much advance it runs (e.g., oil temp).

Of course, you could always fill it up with a full tank of >100 AKI, and with Uprev try and dial in more advance, then save it as a "track day/High Octane" tune...