Hey. So the Foci has what, a 14-15 gallon tank right? Well how come whenever I'm on or below E, (gas light is on), that when I full up, it barely makes 11 gallons. Where are the other 3 gallons?

Its basically a reserve caspacity. Most American cars keep several gallons below the "e"... My miata, when it is on E , you are outta gas!!