Last night, filled up the Grand Marquis and we broke a new record for crappy mileage in it. It got a whopping 13.8 MPG on this tank. Ussually we could see about 18-20 but it has gone down because now my girlfriend who drives the car does pretty much only city driving to get to her work and it is only about a 10 mile commute, maybe less. So just a bit of short little drives. The nice thing is, even though the MPG sucks, she still gets at least two weeks out of a tank. And I still love the car, it just is so comfy.