Hunnington wrote: Diesel Power Magazine that is on the Stand now has a big article comparing the Two. I just skimmed it while in Auto Zone, but i believe it indicated the 5.9 has More Power. it compared several different aspects.
5.9L built starting Jan 1, 2004 have lower emissions and worse mileage than those built before Jan 1. Don't assume your 2003 5.9 gets the same mileage as a 2007 5.9. Comparing autos to autos I would expect the 6.7 to get better highway mileage than the 2007 5.9. City mileage might be a little worse with the 6.7 but probably not noticeable unless you drive all city.
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