I disagree.
My experience with Buick’s = pump gas tune on the edge carries some risk.
Racegas adds some cushion with the ability to build more boost.
I’ve seen Buick experts get +120 rwhp on a racegas tune using FAST. (no other chnages other than fuel and tune)
Street racers don’t check what’s in the tank, I say add some nitromethane and tune away. 