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I had my doubts about the K&N for my Impala, but after installation of the filter, I have noticed a difference and an overall increase in fuel economy when driving carefully. Now, having said that, my fuel economy is worse as well when I stomp on it. More airflow is perhaps allowing the ECM to work a little more fuel into the mix, at least this is the basic rational I have come up with.
Prior vehicles - 68 Plymouth Fury II - K&N filter allowed better low range takeoff and an overall improvement (no numbers to back this, just seat of the pants and over a year of having it in there)
-- 90 Plymouth Acclaim (3.0L V-6) figure a rough average of 3 mpg improvement depending on driving conditions.
-- 89 Chevy S-10 (2.5L 4 cyl) strangely not much mpg improvement noticed, but a definate improvement in getup and gooooooooo
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