The 2004 Hyundai Sonata is available as a 4-door, 5-seat sedan. Starting at $15,999, the 2004 Hyundai Sonata Base (M5) is powered by a 2.4L, 4-cylinder engine mated to amanual transmission that returns an EPA estimated 22-mpg in the city and 30-mpg on the highway. The top of the line 2004 Hyundai Sonata Base w/2.7L V6 (A4), priced at $17,649, is powered by a 2.7L, 6-cylinder engine mated to anautomatic transmission that returns an EPA estimated 19-mpg in the city and 27-mpg on the highway.