The 2020 Chevrolet Impala is available as a 4-door, 5-seat sedan. Starting at $31,620, the 2020 Chevrolet Impala LT is powered by a 3.6LL , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 28-mpg on the highway. The top of the line 2020ChevroletImpalaPremier , priced at $ 36,720 , is powered by a 3.6LL , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 28-mpg on the highway.