OK, thank you for the help here. I went out to the garage and siphoned out the old gas with a little parts store pump. 11 gallons is what I got so I'm pretty sure I got most of it. It did smell a little "off", I had some 112 octane Torco here so I mixed that up with some fresh premium...I feel more confident driving it now. I'll burn the old gas in a mower or something. Maybe a Chevy!