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as someone who tries to get that last little bit out of everything, I run 93 (when I can find it, sometimes settle for 91-r+m/2 octane) and ill tell you what... I gain 4mph with the 93 over the standard 87-89 octane. may be due to poor quality of the lower grades, may be due to the ethanol. ... don't know don't really care....LOL I just know that extra 4mph is handy to have on tap...
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