Not quite sure how to put this, but a guy on another forum posted a question.
He wanted to know if it was possible to syphon the petrol from our cars. The tank only holds 5 gallons.
No one knew because it's really not worth doing for 5 gallons. Anyway a few ideas came in, what he did in the end was to remove the pipe in the boot. And get it out that way.
He had filled the car up to the brim as we say, and then decided to trade it in the next day.
I await his answer to my question.