You're going to get a long list of opinions on this one. Personally, I treat the gas and let it idle long enough to ensure it's into the carbs, injectors, whatever you have and shut it down. Back when I had a 2 Stroke I fogged the engine during this period just prior to the shutdown. Then I try to syphon off the remaining gas from the tank and burn it in the truck. First thing next Fall I fill it up with Fresh Gas. I do this with all my engines for seasonal maintenance and have never had a problem. There's a lot of options and my advice is do whatever works for you.