I believe it, the guys at Hughes sure don't mind saying 93 pump and 12.5 compression is easy.
Now my 1st couple pulls on my engine before rebuild I used my own formula with 3 gallons of 92 pump and a gallon of toluene. It didn't mind it at 11.6 cr.
That just gave me a sinus infection lol
Try it and see, read plugs and go easy with the tune so sneak up on it. There's more to detonation than just octane, same guy said he'd managed 21-1 compression on pump fuel BUT this guy was in his own league.