Got back home last night with around 6km rated range remaining on my 2014 Model S 60. That's around 2% charge. My car stopped charging at 98% (not sure why it wont go to 100%), and it reports exactly 50kwh of additional charge. This suggest that 100% would be around 52kwh. I know there is some reserve, so the actual usable capacity is actually around 58kwh (rather than 60). So does that mean I've lost 6kwh of capacity or is this just the Winter Capacity?