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Worse MPG with K&N drop ins?

Since have installed K&N drop ins and ECU has been reseted. Z is getting worse MPG. The drop down is on highway from around 26 to 22 MPG. Is this

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Old 07-29-2011, 02:18 AM   #1 (permalink)
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Thumbs down Worse MPG with K&N drop ins?

Since have installed K&N drop ins and ECU has been reseted. Z is getting worse MPG. The drop down is on highway from around 26 to 22 MPG.

Is this unusual, or have to get used to?
Guess, that it could be caused by ECU putting more fuel to keep A/F ratio.
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