The first few tanks were during winter. I never went more than 350 km on one tank and believe me, this was a full tank, gas was spilling a couple of times because I tried to go to the gas station less often and I completely emptied it one time to make sure the gage wasn't bad... Bottom line, it wasn't.
Now, the weather has warmed up, no snow anymore, temperatures averaging 20 degree celsius and about 12,000km on the meter. I'm having a much more satisfying ride but it is not good enough. The best I've had so far was about 480km on a full tank (very very full to about half a liter remaining)
All of this is a mix of city/highway driving. More highway driving in kilometers but equal in time (ie 10 minutes city for 10 minutes highway, usually, every day).
I now use the cruise control everytime I can on the highway, I drive around 105 to 115 kilometers per hour depending on traffic and which route/highway I'm on.
Conclusion, my mileage is much better now than it was. I guess it is because it was brand new and now that the break in is pretty much done it is getting better and better.
I estimate that, highway only, I would do about 500 kilometers but not much more than that.
By the way, the worst I had was about 250 kilometers.
4x4 mode on
ESP OFF (completely off, not partially like when you press the button while driving, you have to follow a procedure to do it, I can explain if necessary)
... and fun in the snow for 2 hours doing tailspins, slips and almost flipping the truck over 1 or 2 times, hehehe.
Costly on the gas but I had so much fun. I'll try the same this summer in the mud or sand if I can. The fuel consumption meter went around 27 liters per 100 kilometers at one point, this is where I decided that this was getting too costly to do hehehe.