i sold my 2010 LS with 178k miles on it (fresh trans within the last year) for 4700 through facebook market place. i was concerned it would be difficult to move as well due to all the lower priced impalas of my generation that were selling for less. but i sold it within a week. honestly to me you aren't far off on the price i wouldn't think. but i will say i've seen 2012's for about 6-7k on facebook as well. maybe throw it up on facebook and see what happens, it's free. just my two cents.