Originally Posted by Virtus_Probi
I would imagine you'd still get noticeably better power with premium if Subaru can make an even slightly functional knock detection system...
For some reason I can't get the owners manual to load at the moment... but does it say anything like "87 minimum, XX recommended or something similar? The 5.7 HEMI's are like that, though I can't tell a difference between the 2.... but forced induction is a whole different animal and benefits far more from higher octane.
I would imagine you'd still get noticeably better power with premium if Subaru can make an even slightly functional knock detection system...
For some reason I can't get the owners manual to load at the moment... but does it say anything like "87 minimum, XX recommended or something similar? The 5.7 HEMI's are like that, though I can't tell a difference between the 2.... but forced induction is a whole different animal and benefits far more from higher octane.