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When the discussion turns to engine technology, the lowly piston is often overlooked. Yes, it's a vital part of any conventional gasoline engine, but a piston is just a piston, right? Well, not exactly. Federal-Mogul Corporation has taken the basic piston, applied a slick coating to it and eked out just a bit more efficiency in the process. Federal-Mogul's fuel-saving piston is appropriately called EcoTough and the company claims that its special coating offers superior wear resistance while als