The 2012 Nissan Sentra is available as a 4-door, 5-seat sedan. Starting at $16,430, the 2012 Nissan Sentra 2.0 (M6) is powered by a 2.0L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 24-mpg in the city and 31-mpg on the highway. The top of the line 2012NissanSentraSE-R Spec V (M6) , priced at $ 20,990 , is powered by a 2.5L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 21-mpg in the city and 28-mpg on the highway.