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I traded the Silverado 4 1/2 years ago and the fuel log notebook has long since been re-purposed. It is very possible that the ethanol content was the difference, but isn't that what you were looking for, if there is a difference? All refiners start with the same raw stock and blend in their secret recipe of additives that they think will differentiate them from the rest to gain customer loyalty. Gasoline isn't an element, it is a blend of dozens of compounds in differing ratios.
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