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No, what I'm saying is that the weight makes very little difference. UNLESS, as I've stated before it's hilly terrain. Or twisty roads.
Of course it takes more uphill.
I'll put money on it that the fuel economy of a 40ft curtainsider is less than 10% different between fully loaded and empty, but if you had a trailer full of bricks instead of a big trailer sticking above the cab, it would make even less difference.
UNLESS, I repeat, it's going up and down a lot of hills.
The amount of energy required to keep a mass moving along the road is tiny.
For example, on my ampera, at 80mph on a flat road with little wind, it needs about 20kw. If I open the windows it goes up to 25kw.
If I fully load it it makes so little difference it's almost impossible to see.
However, when I get to a hill, fully loaded it will go up to 60kw,empty it will be 40 on the same hill
A couple of years ago going to Mancy airport to get a flight with three adults two kids and a boot full of luggage. I reset the trip computer on the move at the top of Brockholes brow going down to the motorway. How pleased was i to be doing 94.6 MPG at the bottom of the hill. Soon changed though, average there and back was 34 MPG. Unfortunately the world is not flat. But it would be helpful if it was all downhill.