Ive got an 03 XB9s and fill up every 120 miles +/-. Thats usually when the light comes on. How far can I push it after the low fuel light? I have gotten 40-55mpg depending on how much fun I can get away with. Also how far do you fill it? I have filled to the very top and had gas running out the overeflow. does the center chamber cross over to the sides auto or do you have to fill both sections yourself? I dont want to starve the pump in the middle of no where so simple math w/ tank volume is untrustworthy. Just wondering what you get and how far you go in real world app. thanks[confused]