87 octane vs. 91 octane - Power Hungry Performance Forum

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87 octane vs. 91 octane

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Fri, October 9th, 2009, 12:21 AM

goracer

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Join Date: Oct 2009

Location: OC - CA

Posts: 15

How do you calculate any benefit or loss using 87 at lower mpg but costs less versus 91 which costs more but is a very slight increase in mpg? I beleive it's currently a $.25 difference per gallon.

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