What octane is everyone running on their cars? I know the minimum is 87 octane, with 91 recommended and 93 recommended for M cars.
I’ve ran 87, 89, and 93 octane and have felt no performance difference. Also, I don’t hear any knocking on any octane thanks to the knock sensors.
Car is a g20 m340i with a b58.
You won’t really hurt your engine since your ecu will adjust timing etc for the lower octane, why buy a high performance car if your going to neuter some of the performance with lower octane fuel? There may be additional additives/detergents in premium vs regular, or at least that used to be the case.
Heck I even put premium gas (for the additives), in my lawnmower and snowblower, and both are over 30yrs old. They still run as well as the day I bought them.