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Poor Gas Mileage 2017 MKX Black label 2.7T AWD

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From the time I bought this car in March 2020 I have been getting max 13 miles/ga in mixed drive (hwy and city)

The window sticker says 17 city, 24 hwy, combined 19 mpg.

I have had Lincoln dealership change air filter and add fuel system cleaners but mpg did not change.

I checked online and found faulty oxygen sensor can cause poor mpg but dealership wont change it because there is no code displayed for bad sensor.

How do I resolve this poor mpg specifically in this time of high gas price. Pls help


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