Agree whole-heartedly with this suggestion! In fact, you may want to try charging every other day given the lack of miles. You could also consider changing your Engine Assist Heat to "Delayed". That will only use the engine <18F. With your commute, you'll probably never use gas even running the heat on max.If I were you, I'd experiment with not quite fully charging in the evening. By leaving the car a bit less topped-off, you might still regain a full charge by the time you get to work.
My commute is 24 miles each way. No real hills, but I can only make it if its >40F. :/