The 2020 Mazda Mazda6 is available as a 4-door, 5-seat sedan. Starting at $24,100, the 2020 Mazda Mazda6 Sport is powered by a 2.5LL , 4 -cylinder engine mated to an automatic transmission that returns an EPA estimated 26-mpg in the city and 35-mpg on the highway. The top of the line 2020MazdaMazda6Signature , priced at $ 35,400 , is powered by a 2.5LL , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway.