I did a relatively long drive on a charge. 178.4 miles total drive with all but about 6 miles of it highway to/from Wisconsin. Ambient was about 15F on the way out and about 20F on way back on average (a bit colder in WI and a bit warmer in IL). Most of the driving was at 70-75mph, except for the first few miles around Chicago, and maybe 65mph at the interchange in Milwaukee. The distance and speed are not terribly exciting. Efficiency was 3.3 on the way up, and in total 3.5 m/kWh for the whole trip.
The interesting thing was that upon arriving at home with stale --- was that LS showed 5.8 kWh of power left. I had been driving for 6-8 miles on double --- before arriving home. I forgot to bring LS with me for the trip, hence only the end reading. Low battery was at 9% like it was in the summer. I never hit very low battery. This suggests in cold weather the Leaf takes you to --- earlier than when its warm. I would guess that its to also keep you from getting stuck.
As I charged just before I left, I started and ended with 5 battery bars. I was surprised that I didn't lose a bar during the 3 hours (including the stop to visit in the middle).