The 2008 Maserati Quattroporte is available as a 4-door, 5-seat sedan. Starting at $114,750, the 2008 Maserati Quattroporte Base 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 18-mpg on the highway. The top of the line 2008MaseratiQuattroporteExecutive GT , priced at $ 124,900 , 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 18-mpg on the highway.