The 2006 Mercury Mountaineer is available as a 4-door, 5-seat sport utility. Starting at $31,350, the 2006 Mercury Mountaineer Convenience V6 (300A) 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 20-mpg on the highway. The top of the line 2006MercuryMountaineerLuxury V8 (315A) AWD , priced at $ 34,550 , is powered by a 4.6L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 14-mpg in the city and 20-mpg on the highway.