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I get about 10% better mileage by filling up in Wisconsin, outside the Chicago & Milwaukee regional areas and avoiding the reformulated gas used here. If I understand it correctly, oxegenated gas really only benefits emissions in cars older than ~10 years and heavier gasoline burning trucks. In newer cars the computer controls the mixture based on O2 in the exhaust so more O2 equals a richer mixture. In addition the energy content per gallon of reformulated gas is probably lower and the price is higher.
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