Focus Fanatics - View Single Post - anyone using premium gas ?
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Old 05-22-2012, 08:06 PM   #130
eweisbard
Focus Jr. Enthusiast
 
Join Date: May 2012
Fan#: 99164
Location: Louisville, KY
What I Drive: 2001 white Focus se

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Octane is for antiknock, if its not knocking whay do you need more. Here is something else that I learned a a training school. Ocatne makes fuel more stable to prevent autoignition, meaning ignition from a source other than the spark plug like a hot piece of carbon. Too much octane can actually cause an adverse effect by making fuel harder to ignite reducing performance. I have tried it with absolutly no effect in my 2.0 zetec. Dont assume what people know or have tried.
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