The Triton did very well, in my humble opinion.
Heaps of power (although I still don't like the auto, maybe I should have been a bit more insistent on that when buying) and a pretty smooth & comfy ride too. When not towing it does about 9 - 9.5/100km on open roads.
With the WDH & brake controller all set up just right, it was hardly like I was towing at all. Except for long steep hills, but that is always the case with a big heavy trailer. And because of that, I basically drove at 100k's pretty much the whole way. I reckon if I was a bit more "responsible" and let the speed bleed off on the longer hills and not keep the pedal to the metal I could easily get down to 14lts/100km. The roads were also pretty hilly & winding which was good practise for me, not having towed a twin axle for quite a while.
I am looking at the long range fuel tank and an upgrade to the ECU. I reckon with the latter I could get the economy down to 12 - 13. But someone else in the house isn't keen on my playing with the electronics while the car is still under warranty. Might have to wait a few years for that one.
Stew