Ford Focus Forum, Ford Focus ST Forum - View Single Post - anyone using premium gas ?
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Old 12-03-2011, 10:19 PM   #15
Focus805
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I've run premium since the beginning so I can't do a comparison. But I've had no knocking or shudder or any other problem reported here so I'll stick with premium. I figure this is a 12:1 compression engine that's gonna like the anti-knock compounds in higher octane gas. And the manual says as much. With 2500 miles on the clock I'm getting about 36 MPG in 90:10 highway-city driving, flat roads, low traffic, 60 to 65 depending on conditions.
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