866-699-7684 For this latest generation of the 2012 Ford Fusion, the base four is upgraded to a 2.5-liter unit pumping out 175 horsepower and 172 pound-feet of torque with variable intake variable cam timing, new exhaust manifolds, and electronic throttle control. Ford says efficiency is up over 10 percent compared to the previous Fusion's four-cylinder, now rated at 2333 cityhighway mpg.