That's most likely the result of Ford's much better marketing campaign for the Mustang. All you've heard about is the Ford heritage and anniversary celebration for over 5 years, now. So every time the lay person sees a new "Retro-Muscular" looking car they automatically associate it with the Mustang. I've had people confuse the Challenger for the new Mustang and the Camaro. Most claim they didn't even know the new Challenger was coming.