The 2010 Mazda MX-5 Miata is available as a 2-door, 2-seat convertible. Starting at $22,960, the 2010 Mazda MX-5 Miata Sport (M5) Convertible is powered by a 2.0L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 22-mpg in the city and 28-mpg on the highway. The top of the line 2010MazdaMX-5 MiataGrand Touring (A6) Power Retractable Hard Top , priced at $ 29,500 , is powered by a 2.0L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 28-mpg on the highway.