Hello, In this document it is shown that the efficiency of a gas turbine is determined by the Brayton cycle and it depends on the pressure ratio ε. ε is the compression ratio before fossil fuel burning invests further energy into the gas. I want to be sure that my thinking is correct - If I build a reservoir and perform a very high compression (high ε), efficiency will be high ONLY if the high-pressure gas is supplied to the turbine, which will now be extracting work from the high pressure gas, correct? But if I am to build a reservoir and perform a very high compression (high ε), but use a pressure regulator to drop the gas pressure before the gas enters the turbine, the efficiency should drop, correct? It seems to me that the high ε and high efficiency has to do with the area inside the Brayton cycle curve, e.g. high pressure drops utilize better the internal energy of the supplies gas, correct?