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What Obermd is spot on. I have a 2012 Eco also 6M. I have been "around this block" several times. I have tuned it also. With the tune it runs "OK" with 89 but the power and MPG drop off some. Now that I am back to using premium, the car runs much better and MPG is up.

I have dropped back to 89 octane from 93 a couple of times(but only for a couple of tanks) but seemingly always go back to premium. but have never gone back or even tried 87 octane.
 
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