A new type of advanced cycle with saturated air called a gas turbine with saturation for air (GTSA) is analyzed by graphical exergy methodology based on energy-utilization diagrams (EUDs). By comparing it with an advanced steam-injected gas turbine cycle (STIG), key features of the GTSA system are clarified. The model system may achieve an efficiency as high as 56%. It is about 8% more efficient than the STIG. In addition, some suggestions are pointed out for further research.