The 1999 BMW Z3 is available as a 2-door, 2-seat convertible. Starting at $29,950, the 1999 BMW Z3 2.3 Roadster is powered by a 2.5L , 6 -cylinder engine mated to a manual transmission that returns an EPA estimated 20-mpg in the city and 27-mpg on the highway. The top of the line 1999BMWZ3Coupe , priced at $ 36,200 , is powered by a 2.8L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 19-mpg in the city and 26-mpg on the highway.