Hi, I am a new owner of a 2014 Model S 85, and today for the first time I took it out on a fairly long drive. I charged it fully, and the range listed was 248mi. I drove for 122 miles, and the average Wh/mi listed in the Trips screen was 315 for the whole drive, below but very close to the rated 319 Wh/mi that I have read is used for the range display (I have it set to display rated range, not ideal range). After that drive, I had only 108 miles of range, or 41%. I understand the trip calculation of average Wh/mi includes everything that used power, including climate control. What happened with the other 18 miles? That's a 15% discrepancy, at the rated power consumption. Software is 10.2 if that matters. Thanks for any insight!