Don't worry about the ignition being on while you EOC for fear of wasting fuel, with the ignition on and the engine off, your injectors won't fire so you're not wasting any fuel. Like the others you definitely want to turn the ignition right back on about a second or two after you shut it off. I usually wait at least 1 second or maybe close to 2 just to make sure the engine isn't still spinning, so it won't sputter back to life unintentionally after I turn the ignition back on .
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