The 2021 Nissan Maxima is available as a 4-door, 5-seat sedan. Starting at $37,090, the 2021 Nissan Maxima SV is powered by a 3.5LL , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 30-mpg on the highway. The top of the line 2021NissanMaximaPlatinum , priced at $ 42,320 , is powered by a 3.5LL , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 30-mpg on the highway.