i have an early 2013 Mode S that has been wonderful. However in the last few months it has started to lose range due to significant vampire drain. I scheduled a service visit, but Tesla called and said they did a review of my battery and found no issues with my battery. Said it was normal drain. I've had my car for almost 8 years and have loved it, but this is not normal drain. After call from Tesla I started logging my range and miles. Over the last month I have lost 50% or more due to vampire drain. In one 2.5 hour period, while parked, my car lost 6 miles of range. I called Tesla agin and they said to schedule another service call. I di and it is scheduled for Friday. I will take my log with me, but would love to find out if anyone else has seen the same thing with early release model S's.