I picked up some Sunoco 260 GT when I was in Melbourne Beach a couple of weeks ago.
There is also suppose to be a station in Jacksonville that has it. Just going to try it to get the OAR/KOM number down/up, way too expensive to use on a regular basis.
The OAR reached -1 at 83 miles after a KAM reset.
I used a mix of Chevron 93 and Sunoco 100 for an octane of 94.6.
**It took a KAM reset, using a scanner, to get the OAR to -1. It is possible the fuel was bad but previously even after 210 miles using a different station and 100 octane added the OAR would not move off -.3.
The method of disconnecting the battery over night and connecting the positive and negative cables together does not reset the KAM on my 2020 HPP.
From what I read Ford started using KOM instead of OAR with the 2018 models. They represent the same parameter but are the inverse of each other.
OAR is Octane Adjusted Ratio. The best result is -1.
KOM is Knock Octane Modifier. The best result is 1.
The equation for KOM is (abs(Signed(A)*256)+B)/16384