システムソフトウェア
Older versions of the system software suffered from power drain issues when the car wasn't being used, with the batteries losing 4.5 kWh overnight (known commonly as "vampire drain"). System software v5.8 (v1.49.30), released December 12, 2013, reduced overnight energy loss substantially, to 1.1 kWh per night, or around 3 miles.