877-269-9651 The 2012 Ford Mustang V6 is powered by a 3.7-liter engine producing 305 hp and 280 pound-feet of torque. The Mustang GT steps up to a 5.0-liter V8 good for 412 hp and 390 lb-ft of torque. Both have a standard six-speed manual transmission, while a six-speed automatic is optional. As if this isn't enough, the Boss 302's 5.0-liter V8 ups power output to 444 hp and 380 lb-ft of torque. The Mustang V6 coupe earns an EPA fuel economy estimate of 19 mpg city31 mpg highway and 23 mpg in combined driving with the automatic transmission, while the manual is estimated at 192922 mpg. The GT has an 182521 mpg rating with the automatic and 172620 mpg with the manual.