Keep your gas tank full during all winter to avoid moisture accumulation and then a potential frozen gas line. When it gets really cold and the moisture accumulated in the tank settles, it can turn into ice. Gasoline is lighter than water, so water will always settle and flow into crevices of least resistance (like gas lines). Keeping your car's battery connected to a battery tender (charger) can prevent starting issues as well as many electric malfunctions in today's car's with advanced electronics.