Yep, you are dead right, there is something wrong

We have recently purchased a CF400 for farm work. Our kilometers travelled is 120 and we have used approximately 30 liters of fuel? This equates to 30km per tank, allowing for the reserve amount as specified.
The majority of the work is relatively slow speed, 5-10kph.
We do tow a light trailer to distribute hay (20kg max AUW) and also on occasion a paddock groomer to collect poop (100kg)
I consider this to be an extremely high consumption.
Any ideas?

30km is 18.64 miles...which is about what you should get per gallon..not tank. Are you sure? There is surely something wrong. Can't see any single-cylinder engine even running pushing that much fuel through it.

We have recently purchased a CF400 for farm work. Our kilometers travelled is 120 and we have used approximately 30 liters of fuel? This equates to 30km per tank, allowing for the reserve amount as specified.
The majority of the work is relatively slow speed, 5-10kph.
We do tow a light trailer to distribute hay (20kg max AUW) and also on occasion a paddock groomer to collect poop (100kg)
I consider this to be an extremely high consumption.
Any ideas?