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

Asked by for the 2007 Ford Edge
Has the air filter ever been changed?
2 answers
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.