Ford Focus Forum, Ford Focus ST Forum - View Single Post - anyone using premium gas ?
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Old 01-23-2013, 10:36 AM   #9
mac.mogul
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Ethanol blended fuels will always reduce your average MPG because ethanol has less energy than gasoline which requires more of it to be used.

Power gains/losses between octanes are marginal at best. On older engine management systems you won't see much of a gain unless you change the spark timing yourself with a tune.
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