The 2008 Infiniti G37 is available as a 2-door, 4-seat coupe. Starting at $34,900, the 2008 Infiniti G37 Base (A5) is powered by a 3.7L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway. The top of the line 2008InfinitiG37Sport (M6) , priced at $ 36,200 , is powered by a 3.7L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 17-mpg in the city and 26-mpg on the highway.