Thread: Premium Gas???
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Old 09-10-2011, 06:21 PM   #24 (permalink)
Rokeby
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I wholeheartedly agree.

And now we, or at least I, know two new things about premium vs. regular:
1. Why all premium grade gasolines are not ethanol free, and
2. When used in premium grade gasolines, ethanol functions as an octane
booster, and not as a tailpipe emissions reducer as when used in regular
grade gasoline.

However, there is at least one new question that comes from all this:

What percentage of ethanol is added when used as an octane booster?
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