I've been seeing 2015's coming up for 75-77k with similar miles. Seems fair but I would be slightly concerned if it was a "dealer car". Dealer cars generally get beat on pretty good.
This is a pretty good deal on a 2015 Regal Red. I believe this color is a 3k option alone:
http://www.cars.com/...30006/overview/
Even better deal on a white 2015:
http://www.cars.com/...91209/overview/
The deals to be had right now are 2014 and 2013 GTR's. Just saw a 2013 for 69k and a lightly used 2014 for 71k. Personally, I'm not a fan of the new headlights or taillights and didn't feel the comfort settings were much different from the 2014 to 2015 in order to justify the price difference. Some would argue against me though.