Most Efficient .5 Ton While Towing

VernDiesel wrote:
The new 3.0 liter F-150 diesel would have swept the field. Should average 13 or 14 mpg for this test.

Latest issue of Trailer Life Magazine has the F150 3.0 towing a Lance 2465 that weighs loaded up for the test @6790 lbs.
They got 14.77 mpg towing and 25.64 non towing.
Towing was in the wine country in CA so not just a flat road somewhere.
Biggest issue with the F150 3.0 IMO is the fact that you have to get the Larait or higher trim package to get the 3.0. It's not even there in the XLT.