Focus Fanatics - View Single Post - anyone using premium gas ?
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Old 05-22-2012, 10:05 PM   #154
Kabigon
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Join Date: Jul 2011
Fan#: 88299
Location: Torrance, CA
What I Drive: 2012 sterling gray Titanium

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Quote:
Originally Posted by Power Surge View Post
And how do you think the PCM knows what octane fuel is being used?

By the amount of spark knock it picks up.
Yes, but what is your point?
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