Definiive answer ?? Y or N "05 T6

My dad put cheap gas in his 240 Turbo a few times and it would ping like
crazy. I think the boost was at around 12 psi and of course there's no
knock sensor on those cars. The power limit with virtually any turbo
motor is determined by the onset of detonation, modern engine management
will retard the ignition timing and/or back off the boost pressure to
prevent it, but why spend the money on the fancy hardware then not let
it work to its full potential?

 

Your owners manual has the definitive answer - read it and fill up
with the proper fuel. You can run lower octane fuel but the knock
sensor will send a signal to the engine computer that wil result in
decreased performance and milage.