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Maybe this has been posted before about how the car will react to frigid weather or how close one is to home and needing a quick charge. Sorry if this is a repeat. Here Lutz actually addresses these questions.

How it will deal with frigid temperatures:

"One of the major challenges with the car is writing all the software codes for all of the zillions of possible interactions between driver, electric drive, battery, regeneration, when does the internal combustion engine come in, under what circumstances? For instance, and this is a huge, huge advantage over battery-only vehicles, say you are in North Dakota in the dead of winter at –40 centigrade or Fahrenheit and you’ve left the vehicle out overnight, no battery in the world is going to develop any energy at those temperatures, so if you had a purely electric vehicle, you’d have to find a way to heat the battery to get it up to temperature. In our case the computer will know that it has been sitting in the extreme cold, and will light you off on the internal combustion engine, which will run for a few minutes to warm up the battery so that the battery can take over."

How it will deal with needing a charge just before getting home:

"Another neat feature we will have because the vehicle is OnStar-equipped, is it will have logic in its brain that knows how far away from home it is because it’s used to being charged at a certain place. If you have taken a circuitous route home and are running low on battery, the computer knows “wait a minute, the guy is only 10 miles from home, no point giving him a full charge. I’ll just run the piston engine enough to give him a ten-mile charge because he’s going want to plug in at home."

Here's the articles link:
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