Any benefits to high octane

I also notice my Excursion does better on mid-grade when towing. I know that vehicle well and when I am towing (especially my previous TT) I can feel when the PCM pulls out timing on long, hot grades to prevent pinging. Mid-grade I don't feel it as much. For a few extra bucks, why not?

BTW there is something called "inaudible detonation" so you might not even know when it is happening.

Adam