The 2007 Mazda MX-5 is available as a 2-door, 2-seat convertible. Starting at $24,650, the 2007 Mazda MX-5 Grand Touring (M6) Convertible is powered by a 2.0L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 24-mpg in the city and 30-mpg on the highway. The top of the line 2007MazdaMX-5Grand Touring Touring (A6) Power Retractable Hard , priced at $ 27,620 , is powered by a 2.0L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 23-mpg in the city and 30-mpg on the highway.