The 2007 Infiniti M35 is available as a 4-door, 5-seat sedan. Starting at $41,450, the 2007 Infiniti M35 Base is powered by a 3.5L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 25-mpg on the highway. The top of the line 2007InfinitiM35Sport , priced at $ 44,250 , is powered by a 3.5L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 25-mpg on the highway.