I would guess about 9-10km/l.
I tow a Venter Royal with a Pajero 3.2 Did Auto but my box is modified bigger and both my competitive horses (jumping are 17.2 h and 17.3 h. Eventers are 16.2 and 16.3h and much leaner).
Fuel consumption is as follows:
around town - my wife works in Sandton and sits in the traffic, so 12-12.5 l/100km
open road - me 8-9 l/100km at 120 upwards (best was Drakensberg 974 km 79l)
towing - local do not know, but open road up to 13 l/100km with the biggies.
I guess you would do the same.
Some tricks:
horsebox tyres 3.5 bar.
car front 2.5, 3 bar in the back.
make sure the rig is level with the horses loaded.
Forget about the 150 kg max on the ball - mine is way over that.
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