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It's been well documented that the filter is a very small part of the overall inlet restriction. It's also well documented that if you're driving for fuel efficiency, you will not be needing anywhere near the max airflow.
So to me it seems that any K&N benefit (much like "synthetic" oils) is from a placebo effect.
I would like someone with a scangauge to run tests with the most clogged filter they can find, a clean K&N, and no filter at all. (and don't worry about that last one, I know a guy who ran a 283 Chevy for 100,000 miles with no filter at all)
Any takers?
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