Its an average mileage so I guess you have nothing to worry about. Ive got V6 Mustang with 40000 km mileage about 2 years ago but it was a salvage car. When I was looking for cheap mustang for sale I knew that its an average mileage. So for the used car I think $16,500 an awesome price.
That mileage is nothing, i have 18K total on mine (daily driver) and I've had it for one year, as long as the regular maintenance has been done then you're good to go. I would say though that the price might be too high.
2012 Black V6 Performance, Pony and Security Package, Tint, Take-off leather seats, GT500 Steering Wheel, JLT CAI, Auto Headlight switch, Quarter Win Louvers.