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It seems to me that the engine has less to do with BMW saving money by reducing the number of turbos, and more with them trying to meet CAFE standards. BMW is trying to save money by meeting CAFE standards. When a car company fails to meet mileage standards for the their entire fleet of vehicles, I'm pretty sure they end up having to pay a penalty on a per car basis. Porsche for instance, has paid this "tax" $4.6 million in 2007 because their model range did not meet CAFE standards. BMW sells far more cars than Porsche and could get hit by a much larger tax as CAFE standards increase.
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