Higher octane fuel is more resistant to detonation - if you are worried about it, run a 91 tune with 93 octane gas, or 87 tune with 89, whatever.
Running a 91 octane Bama performance tune on 93 octane gas. 106 degrees yesterday, no pinging.
2013 Deep Impact Blue GT Premium, MT82, Comfort,
Electronics, 3.73 gears, Ford Racing Strut Brace,
Boss 302S 19" wheels,
255-40-19 Michelin Pilot Super Sports,
Bama 91 Octane Race Tune