Earlier quoted context omitted.
> ..as I think most people are just filling up to the top instead of half way.. Perhaps I am missing something here, but are you referring to vehicles in this context? Is it not common to always fill your tank to the top?
Tell me you are an American without telling me you are an American. Jokes apart, in Europe the gasoline is so expensive that you need ~80€ to fill up a small car. For an SUV can be close to 100€. So we just fill up to just what is absolutely necessary and then we live in anxiety :)
When we lived in Europe in the 90s, my mother would never fill up past a quarter tank.