You really need to know your route, we went from Coober Peedy up to Mt Dare then across to Poepells Cnr and up the Hay river track at the beginning of July.
Disco 3 1050 KM travelled between fuel stops ( Mt Dare and Jervois) Used about 150 Litres including an afternoon of serious play on a sand dune near the Poeppel oil well.
From the trip computer average speed about 23KM/H, Average Fuel about 14.5 LT/100KM
I have 180 Litres of fuel capacity and we carried a hard tank across the back floor with 40 litres and a 20 lt Jerrycan of tank water that we kept for drinking once we emptied the 12 1.5 lt bottles of spring water we stashed throughout the vehicle.
We ended up with about 20 Lt in the floor tank and about half a Jerrycan of water.
Two adults , two kids. Lots of washing ourselves with baby wipes 
I'm happy to lend you the hard tank I bought but you would need to pick it up from Yass/Canberra. PM Me if required.
Hope this is helpful
Regards,
Tote
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