The 2004 Mercury Sable is available as a 4-door, 5-seat sedan. Starting at $21,355, the 2004 Mercury Sable GS (100A) Sedan is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 26-mpg on the highway. The top of the line 2004MercurySableLS Premium (500B) Wagon , priced at $ 24,855 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 26-mpg on the highway.