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Originally Posted by Eau Rouge
Redline: Reports to date indicate widespread shortshifting of the S55 which would improve mpg versus redline shifting.
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Exactly, so that favors the S55 even more over the S54 because of their respective power curves. EPA tests likely out S55 closer to peak power than S54.
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HP: Yes, but you're not saying hp is greater factor than rpm where mpg is the subject, are you?
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Power and RPM are interdependent. I'm merely saying it is important to consider the whole picture.
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Some will certainly find the trade off reasonable while others will not. It is what it is.
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The huge power increase is key. Check out the non-M I6 for what the technology has done for EPA numbers when power is kept similar to the S54.