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Message: <blockquote data-quote="kandewinn" data-source="post: 1275987" data-attributes="member: 23041">Ran these for a few hundred miles.  There was no magical moment once I added them.  Fuel economy did not change.  What did happen is My trucks computers did not like them.  Truck slowly developed a rough idle, shift strategies seemed to become confused.  Swapped back to my 22,000 mile oe plugs and every developing issue immediately went away.Lesson Learned...If it ain't broke, don't fix it</blockquote>