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The engine only stops if it has reached running temp and the AC has brought the cabin to the desired temperature. Other power loads can rely on battery like they have always done.
Back to topic: As a European, I am surprised this feature is considered newsworthy. The whole BMW range and most of giant VW have it, and the same can probably be said of many others (haven't done the research). There is so much you Americans can do to improve the efficiency of your great country!