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It's common knowledge that CAI increases fuel economy. While it's common knowledge, it isn't common reality. Same with dirty air filters. A moderately dirty air filter isn't going to affect MPGs in the least.
One possible reason for the confusion is the ambiguity of the word "efficiency". Cold air intakes improve the efficiency of cramming more air into the combustion chamber and boosting peak power, but power efficiency isn't the same as fuel efficiency.
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