Hey John, I have come in late and don't want to repeat too much or contradict too much either, but every one has their own opinion on their cars so I'll give you mine.
I have measured the economy pretty religiously and it varies from mid 11 to high 13L/100km (based on the stock odometer with stock tyres). 11.4 was on the Newel highway trying to get good economy and high 13's is flogging the bejeesus out of it. The factory trip computer is so far out it isn't worth using for economy.
My two kids 14 & 12 love it and prefer it to the 2003 Pajero exceed - but that is because the back window goes down and with the mod chip it sounds tough. I know personally it is not as comfortable in the back as the Paj, but the comfort level is still fine and the kids seriously wont notice. I've had adults in it on trips and no complaints and a couple of "this is better than the lux" comments - maybe that was me
Front seats is a different situation and most on here have issues with them, a few don't. But you can fix them to be OK relatively cheaply. Feel them on a test drive and you will see if they are OK or not.
I talked to a courier driver the other day who pulled up when I was fitting my roof rack - during work hours - busted. He loves his Triton (he wasn't driving it for work, was at home) and reckons the factory LPG is fantastic. Raved about it.
I called him Big Brad and he looked at me like we were at the Mardi Gras so I figured it wasn't Brad from on here.
so I told him about this site. Maybe he thought I said 'big boy'
I would get the diesel if I went again, but I would block the EGR on day one and mod the crap out of it with Monsters chip or MTA's map (or both) because they aren't as quick as the petrol and I like them to be a bit quick.
Edit: I left out one bit. Some of the petrol engines - at least up until now - have a piston issue that causes them to start to rattle a bit after the first oil change. Check the two threads "V6 engine noise/rattle" and "double din" by using the search function at the top.