Quote:
Originally Posted by blipit
Absolutely no way!
Tell me how it will get better than 550i mpg.(17/25mpg)
Same block, producing over 150hp more.
The mpg will be worse than the 550i. PERIOD.
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The block is the only thing that both engines share. The S63Tu is vastly different than the N63.
31 highway might be exaggerated, but keep in mind the N63 only puts out 440 ft/lbs at 1750rpm compared to 500 ft/lbs at 1500rpm for the S63Tu.
Spitting out more power at a lower RPM allows the M5 to maintain the same cruising speed with less engine load. Lower engine load, less fuel used.