Update:
It's been a while. Winter was hard on the efficiency numbers. 19,653 miles, 340 wh/mi lifetime, 60kwh, 19" wheels
Additional notes:
I have been keeping track of this winter's stats. About 14,000 miles during winter at 368 wh/mi. The wh/mi seems to have peaked. Max was 370 wh/mi. It's starting to come down as the weather warms. I will be doing the "big reset" on trip A for summer average in a few days (4-15-14). I was running winter tires (19") which may have added to the usage.
Addition data to fill in the gaps, sorry for the scattershot it's based on random pictures taken (Trip B Lifetime Wh/mi):
-9-22-13 - 4521 Miles - 270 wh/mi
-12-2-13 - 9744 Miles - 292 wh/mi
-12-13-13 - 10667 miles - 298 wh/mi
-1-14-14 - ****miles - *** wh/mi - Winter Tires installed - 19" Rial Lugano w/Michelin X-Ice Xi3
-1-28-14 - 14420 miles - 327 wh/mi
-1-29-14 - 14511 miles - 328 wh/mi
-2-28-14 - 16393 miles - 339 wh/mi
-3-8-14 - 17475 miles - 340 wh/mi - Winter Tires Removed - Back to Tesla Std. 19" w/Goodyears
-4-4-14 - 19653 miles - 340 wh/mi
Heating the car comfortably is what is really pushing the energy usage up.