The 2007 Mercury Mountaineer is available as a 4-door, 5-seat sport utility. Starting at $29,645, the 2007 Mercury Mountaineer Base V6 (310A) AWD is powered by a 4.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 15-mpg in the city and 21-mpg on the highway. The top of the line 2007MercuryMountaineerPremier V8 (125A) 4x2 , priced at $ 31,730 , 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 21-mpg on the highway.