Resale value and what a dealer will give are two totally different things. Plus you factor in how much the new vehicle is worth verses what you will be paying for it. He could have gotted $8,500 but they would have just jacked up the price of the truck the $6,000 difference. Note the Mustang is a V6 and not the current bodystyle, can hurt value a bit there. Still$2,500 is pretty low.