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Old 11-06-2012, 04:22 PM   #24 (permalink)
teej
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Join Date: May 2010
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Assuming you're not getting any condensation from the tanks, 87 octane is 87 octane. However, I observe a ~5% mpg increase when using fuel without ethanol substituted for gasoline. Makes sense given ethanol has less energy content. Detergent additives are the difference between brands. Places like 7-11 and Costco buy from whoever will supply the cheapest stuff.
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