"Do you realize that it's just as inexpensive to fill it everytime it gets to 1/4 as it is to wait until the light comes on?"
As logical as that statement is, I am quite sure that there are many people who somehow think that they are saving gas by running the tank almost dry. On the other extreme, many years ago I had a boss who would stop for gas for his Buick every day or two, and would buy "$5.00 worth" each time. (He only did about about 100 miles per week in city-type driving conditions, and needless to say, that Buick was not an economy champion.)
I once asked him if he realized how much time he wasted by stopping for gas 4 times per week instead of just once per week, and he mumbled something about "not wanting to get gypped". Needless to say, this guy wasn't too bright.