Wired1236,
Go back to that "Ford Towing Guide" and look on page 14. You'll see that the truck GVWR (starting point for payload) is different between the 7.3L and the 6.7L engine options. For the past 3 or 4 years, Ford has been increasing the GVWR for diesel trucks over the GVWR for gas trucks to compensate for the increased weight of the diesel engine, in an attempt to eliminate the marked payload penalty on the diesel's heavier weight.
So, when you look at the "charts" you'll get the impression that the payloads are similar with "only a 100 pound payload difference" but in reality, there's also a 400-600 pound increase in GVWR to "get to that payload difference"...
Plus, there's the annotated footnote that ALL data is derived from the truck options selected to achieve chart data. What that means is the "best payload" is from an XL truck with few options while the "best towing" is from a longer wheelbase truck with all required towing options (which changes the "best payload") and the "best camper carrying" will require reducing the best towing and is not available on specific models.
In other words, the starting point for calculations is NOT THE SAME and it's impossible to use the chart to get an "apples to apples" comparison. Best you can get from that chart (without tearing it apart and rebuilding it) is an "apples to figs" comparison....
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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