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Old 01-15-2010, 12:12 PM   #6 (permalink)
Daox
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Location: Germantown, WI
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CM400E - '81 Honda CM400E
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I would suggest reading over this article: Testing a 'performance' air filter for MPG - Part 2 - MetroMPG.com

It shows the testing and results. The K&N isn't worse, its just not any better than a normal filter when you are driving for best fuel economy.

If you have other testing that shows that the K&N works we'd love to see it.
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