I’ve read about these engines and it seems that these 4-cyl turbo’d engines are prone to pre-ignition. Because of this, they are prescribed a special oil to help with that. I would think if you’re putting lower octane in your car, it would only make the condition more favorable for pre-ignition. Lower octane gas combusts easier than the higher octane gasoline. This is why your race gas has 98 - 110 octane. I always, always, always put 93 octane in with no ethanol. The last thing I want to do is put my Stelvio at risk for pre-ignition and engine problems.
I’d like to try race gas, but at $9.75/gallon it’s a bit prohibitive 😉. It WOULD smell nice though!