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Originally Posted by old jupiter
Maybe "power" is some sort of red flag word here...
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That's a bit of a misconception. Poke around here a bit more and you'll discover plenty of crossover between power/racing and fuel economy enthusiasm. Lots of owners of "fun" weekend cars + modified-for-efficiency daily drivers.
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At the same time, it should not escape the notice of y'all that racers ... are largely responsible for a lot of power-improving techniques that are basic to the fuel-efficiency you want. Cold-air intake
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Maybe not the best first example.

Factory
warm air intakes can be found on high-efficiency car models. Not good for peak power production, but better for economy (partly for the same reason as EGR -- reduced pumping loss).