The 2005 Mercury Mountaineer is available as a 4-door, 7-seat sport utility. Starting at $30,035, the 2005 Mercury Mountaineer 4.0L V6 Convenience (100A) 4x2 is powered by a 4.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 16-mpg in the city and 21-mpg on the highway. The top of the line 2005MercuryMountaineer4.6L V8 Convenience (305A) AWD , priced at $ 33,405 , is powered by a 4.6L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 20-mpg on the highway.