The 2004 Mazda MAZDASPEED MX-5 Miata is available as a 2-door, 2-seat convertible. Starting at $25,730, the 2004 Mazda MAZDASPEED MX-5 Miata Base is powered by a 1.8L, 4-cylinder engine mated to a manual transmission that returns an EPA estimated 23-mpg in the city and 28-mpg on the highway.