When it drops below half-tank is my preference. Usual range is above 700-miles per tank town or country. But having lived in tornado & hurricane country all my life has sensitized me to being low on fuel, ever, as being a mistaken habit.
There are days and drives I don't care to have to think about where to buy fuel (additive quality & freshness), and, as I try to combine trips, my choices when around town are such that I prefer the luxury of fueling when and where I choose. Thus to fuel is as much an errand as any other, and deserves being included with other stops. Rather, other stops may remind me that I'll passing by a favored fuel location, thus -- if under half -- an easy time to keep the tank topped off.
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