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I've often thought the same thing. My conclusion... which of course was the result of nearly zero research..... turbo's are more fuel efficient when you compare the power under the curve to a N/a counterpart. In otherwords, you get more hp and tq downlow in a turbo car say 1500-3500 rpm than a N/A equivalent... this is where most of the world drives 95% of the time. So if you don't measure peak figures but how much power/tq is actually driven, you get more power/tq for you dollar out of a turbo car. If you only look at peak hp numbers... then it seems to be really close.
Take the 272hp bmw I6 the op mentions , if you took how much hp and tq it makes between 1500-3500 rpm, it's pathetic compared to the 335i with n54 or n55. That's what we drive.
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