Originally Posted by 
scarry
				
			 
			The D4 diesel has a usable capacity of around 76 litres absolute Max,dead empty.This is well documented.
Loaded and on a good run,maybe 10L/100 if you are lucky,at 100 to 110km/hr.Say about 700K range,to be safe,max.
Add a bit of stop/start,whatever,say 11 to 12L/100 to be safe.Now we are down to around 600K max.
So in reality,not a great amount of K's for remote and long distant travel.
I don't think anyone would want to run the tank dead empty,so actual is less than above in reality.
And towing a van,2.5 to 3.5T,add 50% for fuel usage approx.
So as you can see,when towing,i always seemed to be looking for the next fuel stop.
Sure, mine isn't  the later 8speed,3.0L.but it won't be far off the mark.
As for the D5,i have no idea,although most published data by the manufacturer on the vehicles fuel consumption is probably quite optimistic.
For a start,the vehicle will be empty,no accessories,and with OEM road tyres,and tested as per some 'standard'test.