Wife is emphatic about it after being caught low during an impending Florida hurricane, when all the gas stations shut down and bailed.
Years later a mechanic said that with these new cars, driving too often with a low tank left the internal gas pump exposed and not insulated by the gas, and tended to fail more often.
Between the two, I now top off when I get near a half tank.
Now the Feds are trying to lighten cars as much as possible to make them more fuel efficient, and you are carrying around a halftank of dead weight all the time.
Shame on you and your carbonfootprint!