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I have found that the biggest to loose fuel is using cheep fuel. I lose 5-6 miles per gallon by using arco gas and Mobil gas in California.The extra cost at the pump with chevron or shell I get 2-3 mpg more. I have records to prove it. The methanol mix sucks. Just more money for the tax man.The colder the temp the less my mileage gets. The car cannot burn frozen water.
By Richard