I always fill at ~1/2 tank too. The closest I've ever come to running out of gas in my KJ is getting down to ~1/4 tank.
Why chance it? In this region, that's just too dang risky. Winter especially. That's how I look at it. Gotta fill up sooner or later, why not keep it on the full side?
...exactly.........if you're gonna drive it then just put gas in it.
Dave