The 2007 Nissan Altima is available as a 4-door, 5-seat sedan. Starting at $17,950, the 2007 Nissan Altima 2.5 (50 State - ) (M6) is powered by a 2.5L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 26-mpg in the city and 35-mpg on the highway. The top of the line 2007NissanAltima3.5 SE (50 State) (CVT) , priced at $ 24,500 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 22-mpg in the city and 28-mpg on the highway.