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Originally Posted by Eau Rouge
Cylinder count matters.
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I would say that using displacement is probably a little more accurate than cylinder count, no? Though I understand you weren't trying to be scientific. Still, if you compared a 2L I4 to a 6.2L V8 (for example) your error margin goes through the roof.
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As to the M3 models, all else being equal, 8 cylinders will consume 1/3 more fuel than 6 cylinders which translates into the E92M3's S62 motor being a third less fuel efficient than the S54 motor.
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All else isn't equal since the S65 has more displacement per cylinder. in actuality, the S65 has roughly 25% more displacement than S54 (not 33%). However, it remains the case that the S65 than the S54 is more efficient on a consumption per unit of displacement basis (for whatever that's worth
).