I have an 04wrx and from researching it seems the tank holds 15.9 gallons. This is how a normal tank goes through my car.
When full I can run nearly 200 miles in the first half tank, avoiding boost when I can, then only get, if I'm lucky, another 100 until the light comes on and is right on the empty line. And when I fill it back up it only takes about 12 gallons. I remember reading somewhere that when the light comes on you have about 3 gallons of fuel left? I haven't chanced driving another 70-80 miles because I do not want to run out. What do you guys think is going on?