The 2010 Maserati GranTurismo is available as a 2-door, 4-seat coupe. Starting at $118,000, the 2010 Maserati GranTurismo Base Coupe 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 19-mpg on the highway. The top of the line 2010MaseratiGranTurismoConvertible , priced at $ 135,800 , is powered by a 4.7L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated 11-mpg in the city and 18-mpg on the highway.