Gas options

Pressure and timing, heat or hot-spots in the chamber, plus loading, are the things that affect what octane fuel to run.And altitude.
Tennessee has a wide range of elevations from less than 200ft to over 6000 ft. So there is no way to get yur tuning right for the full range.
If you want to tune for 87 gas, you are gonna have to tune for a much smaller elevation window.And if yur car has 2.2s in the back well it ain't likely to ever be happy with 87gas.