12-15k/year is average. My own car 4 years and 2 months old only has 32-33k on it but that's cause I live in Chicago so anything I need to do is within a few miles max. Would be even lower but I've run the bitch to Tampa 2-3 times around Christmas.
If those models are similar in features I'd probably be looking at the 2011 as well as I'd rather have something newer that was actually driven then something 7-8 years old with low mileage as odds are if low it was city miles and city miles are horrible for cars, stop/go/idling etc... where highway miles aren't as hard on the car and blow the bitch out.
