My roundtrip daily commute is only 25-30 miles, and I have access to free J1772 charging at work. However, we're expected to move our vehicles from the company chargers shortly after our charge is finished (to let others use them), and I've been following Tesla's advice of plugging the vehicle in every night and charging to standard charge. As a result, I don't take much advantage of the free charging at work, since I would need to move the vehicle after just 45-60 minutes of charging. It would save on the electric bill for me to *not* plug in my Model S at home and wait for the charge to get down to 40-50%, and then complete a standard charge of the battery for free one or two days a week at work. But will this behavior cause accelerated degradation of the battery? Any advice from the battery experts out there?