The GS is the four-cylinder version of the Eclipse, housing 162 horses under its hood. Transmission choice is 4-speed Sportronic automatic The gist of this technology is a boost in fuel economy brought about by an increase in air supply to the combustion chambers at speeds above 3500 rpm. The fuel economy averages 23 city/30 highway This is good for a sports car, although this one is no prize-winner in that category. Its features include air conditioning, 6-speaker audio system with CD player and MP3 compatibility, security alarm, power windows, locks, and mirrors, and remote keyless entry as well as 17-inch alloy wheels, chrome and clear taillight lenses, and an integrated rear spoiler. Safety features on the GS are ABS and a complete set of 6 air bags. Available options are grouped into packages by theme. For instance, the Sun and Sound Package includes a power sunroof, upgraded Rockford Fosgate audio system with 9 speakers, steering wheel-mounted audio controls, auto-dimming rearview mirror, and center LCD display for stereo, clock, thermometer, and compass.