The 2016 Nissan Altima is a 4-door, 5-seat Sedan, available in 9 trims, ranging from the 2.5 to the 3.5 SL w/LED. Upon introduction, the $22,500 2.5 is equipped with a standard 2.5L, 4-cylinder, engine that achieves 27-mpg in the city and 39-mpg on the highway. an Automatic transmission is standard. The $32,690 3.5 SL w/LED is equipped with a standard 3.5L, 6-cylinder, engine that achieves 22-mpg in the city and 32-mpg on the highway. an Automatic transmission is standard.