Unless it has a drain plug on the gas tank, you cant really siphon out newer vehicles without dropping the gas tank. Most newer vehicles have a grate halfway down the fill hose. The best bet is to just use it up, then go to your local garage and have them do a "3-step fuel system cleaning" which costs $50-100 and includes a cleaner that goes into a vacuum line via a IV-like application, a fuel system cleaner that goes into the gas tank, and a thorough cleaning of the throttle body.
If you cant afford the 3 step fuel cleaning after getting the old gas out, then fill up the tank halfway with mid-grade 89 OR better yet premium 93 gas and get a bottle of fuel system cleaner [about $5] to put in with the [atleast half tank] plus/premium gas.
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