The 2018 Nissan Sentra is available as a 4-door, 5-seat sedan. Starting at $16,990, the 2018 Nissan Sentra S (M6) is powered by a 1.8L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 27-mpg in the city and 35-mpg on the highway. The top of the line 2018NissanSentraNISMO (CVT) , priced at $ 25,790 , is powered by a 1.6L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 25-mpg in the city and 30-mpg on the highway.