Nitrogen enriched gasoline is bad - This is a good article about Shell's new nitrogen enriched gasoline. It contains several additives that release 200x more pollution, destroy paint, eat fuel lines and plastic, while promoting fungi growth in your fuel system. Shell worked with automanufacturers to develop a way for us to keep giving them money.
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http://www.examiner.com/x-4824-Tampa-Sports-Car-Examiner~y2009m3d22-Nitrogen-Enriched-Gasoline