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I have been out of the Ford diesel world for a while so I have no clue about this answer. Between the 6.4 and 6.7 with "fuel mileage mods" in mind, which one would get the better fuel mileage living in front of a 5,000lb loaded trailer with a good ton in the bed at all times? Please forgive me...

Found the site while doing some research for the 4bt engine swap I plan on doing in my 84 F150. Ya'll have a nice site with a lot of information. I am particularly interested in anything Cummins that might be useful on the 4bt. I am all ready a member of the 4bt forum. Hello and thanks!