100 is correct. I wasn’t in it for the high octane; I wanted it for the minimal additives and lead content.
Interesting characteristic about a gas vs automotive gas- when sampling fuel from each tank sump as part of the pre flight it was common to get av gas on the hands. All that was required to clean the hands was a quick wipe with a rag or even just wave the hands in a fresh breeze- quick evaporation with near zero residue odor. If I spill auto gas on my hands I wash 2-3 times and there is still residual stink.
I attributed that to additives.
