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The high efficiency utilization of energy conversion systems has been regarded as one of the most effective ways to cope with the everincreasing depletion of fossil fuel and the greenhouse gas effect. The design, optimization and refurbishment of thermal systems definitely need the help of proper application of energy conservation theory, especially exergy analysis. Conventional exergy analysis only considers the energy consumption of each device in isolation without taking the interactions among devices into consideration. In addition, the exergy destruction and exergetic efficiency are always the criterion for the evaluation of the device performances; however, great controversies exist. This paper presents the development of fuel specific consumption analysis considering the interactions among devices to provide more information for energy-savings of thermal systems.