This is an interesting post. I guess I don't understand the anxiety related to 'mileage'. After all, these are off-road, heavy trucks. And, we spend thousands of dollars keeping them running.
I am one of those...
When I had an AM General H1, it would get maybe 11 MPG; it weighed over 7500 lbs. There were owners that would post about improving their milage. And, they would spend many thousands of dollars keeping them running, not to mention upgrades, gimmicks, etc. I was one of those...
It reminds me about a time when I went to the filing station to fill my little outboard boat. The guy next to me was filling his truck, and asked me if I spend much money on gas for the boat (it sips gas). I replied: "I spend far more money on beer and cigars; it's not something that I notice".
I really hope that I don't sound dismissive, but if this vehicle creates anxiety about mileage (among many other things), this may not be the vehicle for you...