I've had my 2012 Ford Fusion SEL with the 4 cylinder engine, FWD, & 6 speed automatic transmission for one year. I average 25-26 MPG city and 34 MPG highway. I have all of the options except the NAV, but I have a Garmin. I previously had a 2008 Lincoln MKZ and, aside from the motor, it is the same car which is why I bought it. The 4 cylinder is certainly not as peppy as the V6, but it pays you back at the pump as the Lincoln averaged 19 MPG in town. Also, if you don't mind the Blue Oval instead of the Lincoln badge, there is an over $9000 price difference.
Leather interior, sunroof, comfort, Sony Sound System, reverse sensing system, huge trunk, Tire Pressure Monitoring, and gas mileage. The downhill mode on the transmission also saves your brakes.
It would be nice to get more power out of the motor without effecting the MPG, but the current engine works fine.