The 2016 Nissan Altima’s 2.5-liter four-cylinder engine produces 182 horsepower and 180 pound-feet of torque. Power is sent to the front wheels through a continuously variable transmission (CVT) with simulated stepped gears to feel more like a conventional automatic. The EPA estimates fuel economy at 31 mpg combined (27 city/39 highway). The 2.5 SR drops slightly to 30 mpg combined (26 city/37 highway).