The 2010 Infiniti G37 is available as a 4-door, 5-seat sedan. Starting at $36,050, the 2010 Infiniti G37 Base (A7) Coupe is powered by a 3.7L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway. The top of the line 2010InfinitiG37Anniversary Edition Convertible , priced at $ 54,900 , is powered by a 3.7L , 6 - cylinder engine that returns an EPA estimated 17-mpg in the city and 25-mpg on the highway.