poor fuel economy on 2007 Ford Edge

why am I getting 14 mpg on a fwd ford edge I was getting about 16-17 about 4 months ago

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2 answers
Has the air filter ever been changed?
I have a 2007 Edge with 3.5 engine My latest trip where I checked highway mileage got 28.46 mpg. I would not except either set of mileage numbers that you are getting.