I've had one winter with my coupe and my $.02 is that you need the float charger for sure, not just to save the battery but to avoid those annoying alarm problems. I put fuel stabilizer in but got a light on the dash the next time I ran it, don't know what that was about. Anyway, that part of it seemed to clear up after a little bit. I didn't do anything else and have not noticed any problems, as yet.