Most Efficient .5 Ton While Towing

Perrysburg Dodgeboy wrote:
So why didn't they use the new 3.0 diesel Ford has?

Then everyone would be complaining that TFL is comparing Apples to Oranges. Having said that these gas powered trucks are probably not the most fuel efficient gas power available, but rather the best performing gas engines available. I would like to see both towing performance and fuel economy quantified.