First of all, I'm the proud owner of a new blue midrange M3. I drive 61 miles each way to work and there's available a 120v receptacle for charging there. Btw, I received my car 2 days ago and haven't drove it to work yet, should I charge it at work which I think could give me a little over 40 miles and then plug it at home? I'm thinking of the savings of partially charging at work but don't want to degrade the battery any faster by doing that..I need the communities' feedback on this.