Thanks for the report! I'm at 6 months Friday.
Decreased range in winter seems to be from all of the above.
1. When batteries are cold, car will use some of its stored electricity to run the battery warmer while driving, but not while parked. If plugged in, will use that energy to keep them warmed. Keeping garaged might help if garage is heated and you're taking very short drives, so batteries wouldn't need to be heated by the car. Otherwise not so much. Keeping plugged is good though.
2. Cabin heater is very effective, but not energy efficient at all. Driving mixed city-highway, under 30F I see more than 50% more electricity use, or available range about 60% as much as range w/o heat running.
3. Available battery capacity is less. Not sure if it can't charge as fully, won't deplete as completely, or "leaks" electricity while running, but I see ~16kWh available in very cold weather vs 19.5 in good weather.
Bay Area, Santa Barbara, San Diego, pretty much anywhere on the coast... perfect EV locations. Central Valley, LA on the other hand... Pretty hot. I am in Chicago- despite the cold issue EVs are actually a great fit here too. Terrain is crazy flat. Traffic is thick, favoring EV/hybrids. Summer isn't too hot. Electricity rates are below average. And we don't have the sprawl nearly as bad, so ranges of current EVs work just fine here. Now if the auto manufacturers would just figure this out and start marketing EVs here, things could happen.
I don't mean to be a hater, but the carpool lane thing seems wrong to me. When I was a kid living in LA, carpool lanes were made to ease traffic congestion. Air quality was a side benefit. Now obviously you focus on the air more, but I hope all those with access stickers are bringing a few passengers along for the ride once in a while. Are hybrids still given stickers too? With all those priuses, are the carpool lanes any faster than the main lanes?
2013 Ice Storm FFE, Dec 2012