If you do a lot of city driving, particularly stop-and-go, but you want great mileage, you would be far better off with a hybrid! That's really there forte -- stop-and-go. In city driving where you may stop at a light, then when the light turns green you move 250 feet until you hit the next light you waste gas accelerating and sitting there, but a hybrid will often shut the engine off at the light and not even turn it on when you move the 250 feet to the next light. That makes a HUGE difference.
It is likely that Ford could tweak the mapping during acceleration to improve on stop-and-go driving but this is not an area where conventional cars shine...
2012 FF Ti HB Sonic Blue, Built 5/7/12, 401A + Parking Technology Package and MFT w/NAV 3.0.2 -> 3.2.2 -> 3.5.1 -> 3.6.2