The 2009 Mercury Mariner is available as a 4-door, 5-seat sport utility. Starting at $22,650, the 2009 Mercury Mariner I4 (110A) FWD is powered by a 2.5L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 28-mpg on the highway. The top of the line 2009 Mercury Mariner V6 (320A) 4x4, priced at $25,410, is powered by a 3.0L, 6-cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.