The 2004 Lexus IS 300 is available as a 4-door, 5-seat sedan. Starting at $30,805, the 2004 Lexus IS 300 Auto Sedan is powered by a 3.0L , 6 -cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway. The top of the line 2004LexusIS 300Wagon , priced at $ 30,805 , is powered by a 3.0L , 6 - cylinder engine mated to an automatic transmission that returns an EPA estimated 18-mpg in the city and 24-mpg on the highway.