The 2006 Aston Martin DB9 is available as a 2-door, 4-seat coupe. Starting at $165,400, the 2006 Aston Martin DB9 Coupe is powered by a 6.0L , 12 -cylinder engine mated to a manual transmission that returns an EPA estimated 12-mpg in the city and 19-mpg on the highway. The top of the line 2006Aston MartinDB9Convertible , priced at $ 174,900 , is powered by a 6.0L , 12 - cylinder engine mated to a manual transmission that returns an EPA estimated 13-mpg in the city and 18-mpg on the highway.