some people just tune differently.
You can tune parameters for say 93 on one tune, and 100 on another (especially when you have a patented program switching system like APR)
Or you can tune with parameters with some elasticity to let the car take advantage of higher octane, but the tune will also protect the engine and be safe if it’s only running say 91 or 93.
I think the JHM tunes will take advantage of around high 90s even if it’s a pump gas tune.
Case in point, they just ran a car on California 91 with stage 1 tune and boost. It trapped 118 MPH. They ran the same car with some race gas, but still on the 91 tune, and it trapped 123 MPH…even trapped 125 on one pass with a terrible launch.