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Are you sure there's not something wrong with the Focus like bad wheel bearings? Mine is super quiet on the highway and 40MPG is easily attainable. Mine does have the "fuel conomy" 3.56 gearing. But even running at 75-80 on the highway it gets 35MPG with no aeromods at all.
My old Taurus would get 34MPG running at 65 on the highway.
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