Focus Fanatics - View Single Post - anyone using premium gas ?
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Old 08-07-2012, 03:08 PM   #438
slow3v
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Join Date: Jul 2012
Fan#: 101709
Location: Endwell, NY, NY
What I Drive: 2012 Sterling Gray Focus SE MTX

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I notice a lot smoother engine performance with 93 vs 87. IMO even with DI, 87 on 12:1 compression especially with high ambients is asking for trouble. It doesn't do that low RPM "buck/bog" like it did from 1200-2500 in a higher gear on 93, and I feel it pulls a LITTLE harder - especially down low.

I'm going to keep running 93 anyway. Has more detergents to keep the intake valves carbon free (characteristic of DI engines).
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