The 2006 Nissan Sentra is available as a 4-door, 5-seat sedan. Starting at $13,200, the 2006 Nissan Sentra State) (M5) is powered by a 1.8L, 4-cylinder engine mated to a manual transmission that returns an EPA estimated 28-mpg in the city and 35-mpg on the highway. The top of the line 2006 Nissan Sentra S State) (A4), priced at $16,000, is powered by a 1.8L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 28-mpg in the city and 34-mpg on the highway.