My mother drives a 2011 Edge, I drive a 98 Explorer. Anyways I've been driving her Edge for a few days and her car uses an insane amount of gas. The car says that it averages around 23 MPG but it'll say it has 120 miles left to empty. I would only drive about 5 actual miles and then it'll say it has 110 miles left. I drove to my work the other day (less than 2 miles from my home) It had I think 90 miles left to empty and by the time I get there it has about 83 miles to empty.
Does anyone have any ideas as to what could be the cause of this?