The 2017 Chevrolet Impala is a 4-door, 5-seat Sedan, available in 6 trims, ranging from the LS w/1LS to the Premier w/2LZ. Upon introduction, the $27,300 LS w/1LS is equipped with a standard 2.5L, 4-cylinder, engine that achieves 22-mpg in the city and 31-mpg on the highway. an Automatic transmission is standard. The $35,645 Premier w/2LZ is equipped with a standard 3.6L, 6-cylinder, engine that achieves 19-mpg in the city and 29-mpg on the highway. an Automatic transmission is standard.