wow 10% drop in the efficiency just due to the cold weather..seems excessive, were you driving at your normal speed?
what were the outside temperatures that day?
range drops relative to the outside temperature:
http://canadianleaf.wordpress.com/2013/ ... o-winters/
his conclusions regarding how leaf performs in the winter:
Range definitely drops but how much it drops mainly depends on how much you use the cabin heater, not necessarily on the outside temperature.
If you heat up the cabin like a furnace and drive like there is no tomorrow, your typical 140 km range can easily drop all the way down to 60 km or even less. But if you manage to keep your cabin cool, drive conservatively, and use some of the techniques described below, you can still drive 100 km under fairly low temperatures.
With a short commute like mine (17 to 29 km each way), winter range is rarely a concern. However, if I need to run some errands in the evening, I do need to top off the charge during supper. To me, that’s main difference between summer and winter. In the summer, I rarely need to charge during the day.
During the weekends, most of our driving is spread out during the course of the day, with many opportunities to recharge at home. For longer than usual winter drives, we take our range extender (my wife’s car).
Heavy snow fall increases rolling resistance, and heavy freezing rain requires you to run the windshield defrost most of the time. I find these two conditions actually worse than a bone chilling but sunny day.
There are several techniques you can use to minimize the use of the cabin heater. It is essential to pre-heat the car before you leave, using grid power, and take advantage of the heated seats and heated steering wheels, and keep your winter jacket on.
The 2013 model has a more efficient cabin heater that is expected to perform better than the one that I have, but its performance is yet to be tested under very low temperatures.
Range concerns aside, the Leaf is the most comfortable car I’ve ever had in the winter. The extra weight from the batteries and the traction control system make it very safe to drive under heavy snow and slush conditions. It doesn’t have any problem “starting” in the cold, or that heavy and sluggish feeling of a gas car in the winter.