I think that if you have no major problems, keep it. It's still relatively new, and you'd lose a lot of money trading it in now.
If you did, get pricing info. When my mom got her Fusion, we got the dealer's offer and a carmax offer to buy it, we chose carmax because it was $2k more.
Avant Garde M310 18x8.5 Satin Silver. Engine Cover w/ Sonic Blue Accents. Sonic Blue Door Grabs. KW V1 Coilovers. OEM Titanium Headlights. OEM Replica Spoiler. K&N Air Filter.