The 2004 Subaru Legacy is available as a 4-door, 5-seat sedan. Starting at $20,820, the 2004 Subaru Legacy L w/35th Anniversary Edition (M5) Sedan is powered by a 2.5L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 21-mpg in the city and 27-mpg on the highway. The top of the line 2004SubaruLegacy2.5GT (A4) Wagon , priced at $ 27,120 , is powered by a 2.5L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway.