KBB.com 10 Best Used Sports Cars Under $30.000. Boasts 27 Highway MPG and 18 City MPG! This Ford Mustang boasts a Regular Unleaded V-6 3.7 L/227 engine powering this Automatic transmission. Wheels: 17 x 7.5 Sparkle Silver Painted Aluminum. Trunk Rear Cargo Access. Trip... via V12 Software