for the base case is about 20% which is typical for automotive en- gines operating at these conditions [25]. For increases in the com- pression ratio, the exergy destruction decreases slightly due to the pressure increases (which has a greater impact than the effects of the temperature decreases) [26]. For decreases in the burn dura- tion (case 2 to case 3), the exergy destruction decreases slightly due to the increases of the combustion temperatures (see Fig. 6). The exergy destruction increases as the mixture is more lean (case 3tocase4)andasEGRisused(case4tocase5)–thisisduetothe lower combustion temperatures (see Fig. 6) for both these changes. The effect of combustion temperatures on exergy destruction is discussed in several references (e.g., [27,28]).