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    Better Mileage: <2K RPM or add ons?

    Has anybody had any experience improving mileage and power with add ons? Is keeping acceleration down to 1500 rpms the best suggestion? When I bought my 2007 ExpyXLT I expected better mileage. (Silly me!) I had previously owned two Ford Vans on 1T frames with 4.5L engines. Their mileages were...
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