I haven't used the heater yet, so that will be interesting to see what that does to range. I have the weather package though, which was suppose to be a lot better than without. I tried the seat heater and it felt nice, didn't appear to change the GOM.
The nice thing is, since we only put about 20-30 miles per day I never really need to worry. I've noticed that when I drive I averaged about 4.1 miles / kWh and when my wife did she averaged about 3.75 miles / kWh this summer. (someone might be a lead foot!) But that's still a lot better than my truck or even our outback. Even if she cranks the heat up this winter I have to believe its still a lot better than getting 13 mpg in my truck or 23 in the outback. Our outback was suppose to be 32 highway 24 city but around town it never gets much above about 23. And that is a 4 cyl.
Checked my data this AM and my HX has started to drop. Noticed my average battery temps now in the low to mid 70s instead of mid 100s this summer.