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Getting a P0171 lean code on my 2.5L (with 140K miles) and getting horrible fuel economy. I understand it can be a somewhat common issue on these with the intake mfld gaskets leaking. Is this true of this generation Mazda 3 or was that mostly only a problem on previous iterations? Along those lines -- I am wondering what other areas/components on this engine like to cause vacuum leaks and also wondering if the fuel pumps on these are also known to cause a lean condition.

Thanks.
 
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