The 2004 Mazda Mazda6 is available as a 4-door, 5-seat sedan. Starting at $18,995, the 2004 Mazda Mazda6 i (M5) Sedan is powered by a 2.3L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 24-mpg in the city and 32-mpg on the highway. The top of the line 2004MazdaMazda6(A5) Sport Wagon , priced at $ 23,425 , 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.