I've seen discussions on other forums where they talk about superfilling a tank using the "burping" method. You fill up the tank until the nozzle clicks. Then you slowly put in a few milliliters, let it settle in, then keep repeating this until your car is ready to puke. Others say they push on the bumper violently to force any air bubbles in the tank to pop out, thereby creating additional space for liquid gas to come in. One extreme method involved jacking up one corner of the car, again with the idea that doing so would force air bubbles to come to the surface.
Hey, don't give me that look, I don't make this stuff up.
