I am in the view the code only addresses gas fired appliances immediately no matter if This can be the intent or not. I would, even so, endorse that propane tanks be emptied just before storing cars—that is a possibility mitigation approach and never automatically a code-centered requirement. (I had https://garagesmartlift09764.theideasblog.com/35288863/the-fact-about-garage-smart-lifts-that-no-one-is-suggesting