No guesses for the above picture location? Hint, its in WA.
Avitar, personally not a huge fan of the XV, and its 'smart' engine on/off technology to try and save fuel. Go the Forester.
John, my old girl has 195L on board without any jerry cans. I have fabricated provisions to store / mount 4 jerry cans when needed (another 80L). But generally speaking with the ute, storage and space is never an issue. I could easily stick 500L in the tray if i was crazy enough.
3 weeks from Tas to the Simpson is cutting it fine. Certainly doable tho and i wouldnt say no

280L to do a standard Simpson crossing is overkill tho, and asking to break something if your time poor and in a hurry.
Ferozious, IMO to 'go anywhere' in Australia, realistically you need around 200L on board minimum. However, times are certainly changing and the modern common rail diesels are resetting the bar in terms of fuel economy, however i would argue that the vehicles themselves are less reliable and certainly no where near as user serviceable as the older vehicles. That said tho, load them up with heaps of weight, and drive them in hard terrain and their economy very quickly goes out the window. If traveling in a group, then this is less of an issue, add satellite phones and endless funds even moreso

but if traveling solo as we do most of the time one needs to be 110% confident in their vehicle and in their ability to fix anything that might come up. The 40 Series Landcruisers might be just about the oldest the harshest and roughest vehicles out there but IMO they are the toughest!
I doubt there are many people in the world that can say they have had the publican of the Birdsville Pub come out and take a photograph of their vehicle, but we can
The longest and most remote iconic track in Australia is the CSR. Call it 2000km to keep it simple. One needs to be able to do at least 1000km to reach the fuel dump point in the middle. But should you need to turn around and go back, one definitely needs to be able to deal with these sorts of contingency plans. The Madigan line across the Simpson is the other famously tough and remote trip one could do however it is becoming more and more popular and this it is nowhere near as difficult as it used to be. For it, one really should be carrying at least 300L of fuel.
Travis.