The 2007 Maserati Quattroporte is available as a 4-door, 5-seat sedan. Starting at $110,600, the 2007 Maserati Quattroporte Base DuoSelect is powered by a 4.2L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 16-mpg on the highway. The top of the line 2007MaseratiQuattroporteExecutive GT Automatic , priced at $ 122,400 , is powered by a 4.2L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 12-mpg in the city and 17-mpg on the highway.