When I got mine painted, I ran mine down until it was almost empty by riding and then removed the tank, including removing the fuel pump. Then I emptied the rest into a gas can by turning the tank upside down.
Put the tank up on the proprod, which sends the fuel to the back (duh) and slip in a length of soft surgical hose to syphen through. You'll be able to get most, if not all of the fuel by directing the hose to the left side (kickstand side).