The 2001 Nissan Altima is available as a 4-door, 5-seat sedan. Starting at $15,140, the 2001 Nissan Altima XE (M5) is powered by a 2.4L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway. The top of the line 2001NissanAltimaGLE (A4) , priced at $ 20,390 , is powered by a 2.4L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 28-mpg on the highway.