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I think racprops has a point, in that, while some techs benefit both power and efficiency, they are just as often add odds with one another.
Faster combustion, due to clever combustion chamber design? Improves both.
Offset crankshaft? Drastically cuts max safe RPM (big loss in power) but improves BSFC. You won't see this on race engines. Likewise, you won't see a non-offset crank on an economy engine, at least in anything made in the last decade.
There are examples on both sides, of things that help both, and things that improve one at the expense of the other.
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