http://www.teslamotors.com/blog/infinite-mile-warranty
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Range is the huge concern. and electric may never be for everyone until we get to the point we just swap out batteries, or have recharging roads. and in the extreme cold, car batteries can lose up to 40% of their charge simply by being shocked by the cold temps. not to mention electric heating is hardly efficent, and takes quite a bit of power. so winter range is HORRIBLE.