The 2008 Mercury Sable is available as a 4-door, 5-seat sedan. Starting at $23,935, the 2008 Mercury Sable Base (100A) FWD is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 28-mpg on the highway. The top of the line 2008MercurySablePremier (130B) AWD , priced at $ 29,575 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 17-mpg in the city and 24-mpg on the highway.