Where I live 91 is often mid-grade, with 93 being premium. I've read that folks with the 3.6 are wasting their cash using something more than regular. Same deal with the 2.0 - manual says 91?
I've watched multiple dyno runs and scans of 3.6s accross the board.
For those who say they don't benefit from premium fuel...have NOT looked at these cars on the dyno.
Yes, post back to back dynos with no change but fuel.Post the dyno results.