2012 Lincoln MKZ Hybrid - Dropping mileage

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You may be experiencing the built-in shutdown of the battery. Read this:

2010 Mercury Milan Hybrid - MPG going down

My Mercury Milan Hybrid is gradually getting poorer and poorer mileage. Over the years it has gone from 38-39 MPG down to 32-33. I have replaced the spark plugs and the air filter with no change in the MPG. Any idea why?

I did the fix on my 2011 MKZ hybrid, mileage went back to normal.