The 2005 Mazda Mazda6 is available as a 4-door, 5-seat sedan. Starting at $18,995, the 2005 Mazda Mazda6 i Base (M5) Sedan is powered by a 2.3L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway. The top of the line 2005MazdaMazda6Sport (A6) Sport Wagon , priced at $ 25,395 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway.