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97 Posts
Why 87 octane?
It is rare to find 100% gas anymore. Therefore, both the 87 and 85 gas probably have 10% ethanol.87 is prolly 85 with 10% ethanol added. gasoline with ethanol has less energy per gallon and will result in lower mileage.
i'd go back to the 85 if the van seemed to like it okay.