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My check engine light keeps going on. Scans indicated lean air/fuel ratio banks 1 and 2. I have a K&N air intake and a Hi-Teck mass air sensor. Mileage has dropped from 10.6 mpgs to 8.8 in the last 3 months. Any suggestions?
 

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Why is it lean?

Air is leaking in past the mass airflow or is coming in before the oxygen sensor.

So intake gaskets, exhaust cracks in the exhaust, bad O2 sensor

Or

Fuel system is not injecting enough fuel like plugged injectors. My 8.1 had a completely plugged injector amd was misfiring.

Or

Engine misfire which allows oxygen to go into the exhaust. Plugsm wires, coils

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