KBB.com 10 Best Road Trip Convertibles. Only 89,270 Miles! Boasts 29 Highway MPG and 19 City MPG! This FORD MUSTANG boasts a Gas V6 3.7L/227 engine powering it's smooth transmission. Pwr door locks, Rear wheel drive, 6-speed manual transmission. This FORD MUSTANG Comes... via CarSoup