We sold and ran Amoco 93 premium when I worked at Mercedes/Benz. That is all my Ford buddy and myself would run.
Have you considered marine fuel?? Anything sans Ethanol has to be better then pump stuff. I run 90 octane recreation only fuel in my boat, generators and lawnmowers and very happy with it.

dude, you missed out on all the BIG fish!! We caught 22 Tarpon this season, over a dozen jewfish, lots of snook, redfish and seatrout!! Shark bite is hot right now.