This is presumably because diesel is more efficient and is not wasting energy as heat (which would otherwise in part be used for heating up the car )
I'm interested as well as I bought my car in april and have yet to experience a cold day in it.
I di dhowver have the heated seat on the otehr day and found that very warm. Certinly seemed quicker and warmer than in my previous E39 so that may compensate as well.
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