The 2006 Mazda Mazda6 is available as a 4-door, 5-seat sedan. Starting at $22,210, the 2006 Mazda Mazda6 i (M5) Hatchback Sport 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 32-mpg on the highway. The top of the line 2006 Mazda Mazda6 i Grand Sport (A5) Sedan Grand Sport, priced at $00, is powered by a 2.3L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 24-mpg in the city and 31-mpg on the highway.