I lived in the UK in the early '60s (including the north, Carlisle) and I don't recall winter cold requiring an optional heater. I currently live off of Lake Erie in a snow belt and still wonder why it would be necessary (especially at 1130 pounds). In fact, in winter weather, it puzzles me how BMW manages to get a 2 liter diesel to provide warm interior air in less than two miles of driving.
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