utherjorge
Observer
Personal experience says that's not accurate. Arizona, Utah, Nevada, and even New Mexico during a holiday trip have been over 300 miles between fuel stops for me a few times.
Allow me to agree, and say that with OEM range on my GX at around 300, I took it out last week and did some minor off-roading to scout for dispersed campsites with friends. Slow going, though we did get into a swamp at one point that had been dry and flat week ago. Despite no real wheelspin, and nothing demanding, I'll bet my mileage was much closer to 10 that it was to the 15 and up I normally get.
300mi/15mpg stock is really not great, especially for a clean sheet design, but perhaps this was a noted compromise. I suspect no one has figured out a long range/duel tank at this time, or someone would have mentioned it.
If I were truly booneying on the regular, I'd go for the extra tank for sure. Already relocated my spare out back so I have the option. I bet Aussies will drive this future Gren hack, just as with the LRA tanks.