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?

2010 Mercury Milan Hybrid - MPG going down

texases January 6, 2020, 3:23pm 5

Here’s that discussion:

My '11 MKZ hybrid dropped a couple of mpgs when I switched tires.

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