My 2014 Fusion 1.6 has used a small amount of coolant since I first got her. A few weeks ago I got a CEL for P303 cylinder 3 misfire. Replaced the plugs, it came back, swapped the coils, and it continued. The other morning on startup the car idled very rough and eventually stalled. After starting it back up there was no smoke, but I could smell a strong coolant smell. So it went to the local dealer who I have been dealing with and buying all my family's cars since 1999.
The dealer pressure tested the coolant system and found a leak in cylinder 3, (there is the misfire and coolant smell), and a slight leak at the water pump. (That could be unrelated, and maybe why the car was loosing coolant in the first place.)
My service tech, is now working with ford to see what can be done since this is a known issue on the 1.6L Ecoboost, in the Escape, Fusion, Focus, and Fiesta ST.
Just figured I would mention this here for anyone else having similar issues, and I will update as we find out whats going on.