This has been an interesting read. It seems the computer is still optimistic on its MPG calc's.
The MPG people are reporting with this car is downright impressive given its performance and their cruising speeds. In ECO mode can start/stop still be disengaged? I would not think the small MPG advantage of stop/start is worth the wear/tear on mechanical components (most specifically the starter). You may save a few bucks in gas but first time you have to replace a BMW starter you'll have eaten up all that savings...
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