The 2012 Maserati Quattroporte is available as a 4-door, 5-seat sedan. Starting at $127,250, the 2012 Maserati Quattroporte Base is powered by a 4.7L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 12-mpg in the city and 19-mpg on the highway. The top of the line 2012MaseratiQuattroporteSport GT , priced at $ 135,200 , is powered by a 4.7L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 12-mpg in the city and 19-mpg on the highway.