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Originally Posted by dmbrisket 51
well where do you live? if your in the northern snowy/cold states, yes, in the south no, winter grade gasoline is not as good as summer grade gas where it gets cold and this reduces fuel efficency already, and its cold air going into your moter in the winter anywayse
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How can a K&N or any airfilter affect the engine performance in the winter month? The air temperature to the motor will be the same regardless of the filter type. The quantity of air into the motor is basicly constant based on the motor revolution since the motor is a constant discplacement.
I have been using a stock type K&N for 3 years with no problems. I have had reduction in milage during the winter months with both filters. It is not the filter but a combination of temperature, related fuel mixtures, additional friction in greased components etc.