The sign? Or you want the lift?
The only thing going in my tank other than gasoline is fuel system cleaner.
Highest octane that was available in my region used to be Sunoco 94.5. Not sure what happened to it, but now if I go to Sunoco, the highest octane they have is 93. In the spring we went with a car club on a drive up to Maine and the highest octane they had at major stations like Shell or Mobil were 91.