The 2004 Mitsubishi Eclipse is available as a 2-door, 4-seat coupe. Starting at $18,399, the 2004 Mitsubishi Eclipse RS is powered by a 2.4L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 23-mpg in the city and 31-mpg on the highway. The top of the line 2004MitsubishiEclipseGTS , priced at $ 24,649 , is powered by a 3.0L , 6 - cylinder engine mated to a manual transmission that returns an EPA estimated 21-mpg in the city and 28-mpg on the highway.