The article presents new data on energy indicators, such as specific fuel consumption and power plant energy efficiency. The use of the obtained data makes it possible to establish the dependence of specific energy indicators on the levels of loading of the power unit. The established distribution makes it possible to determine the optimal parameters of the experimental setup and flow rate at different load levels. The highest specific fuel consumption is observed (1189-1297 g/(kWh) and 962-1147 g/kWh)) at the lowest and highest load for different types of fuel. Experimental data show that ethanol-free fuels can generate more electricity to be used when demand is higher.