I know one of the biggest questions I get is "how does the temperature affect your range"? Today here in Portland it's been pretty chilly the last few days with lows in the teens (15*F this morning) so I've gotten to see pretty much the worst of the range hit.
Here are the facts. My commute is ~20 miles one way with 50/50 city and highway driving. Most of the time the highway is around 55mph tops so I'm not really bombing along all that fast. When the outside temp gets below 50*F I will use the heater set at 70*F. Above that and I don't use any HVAC (well, maybe AC up into the 90's but that doesn't happen that often).
Here is a good comparison of my commute in the summer and winter.
Summer time commute (~75*F) -> use 18% battery. Overall range = 111 miles
Winter time commute (~15*F) -> use 35% battery. Overall range = 57 miles
Half the range when the temp goes down. Now I may be able to eek out a few more miles if I gut it out and not use the heater but screw that. These are also the best and worst conditions so it's not like this is the norm all the time. Here in Portland it is likely to get back into the 40's next week so things will improve some for the range.
Anyway, that's just a little FYI on what I've noticed and hopefully it lets people know about what to expect.