With the savings from a 1 bar decrease in pressure you can buy yourself a sailing boat
Reducing the pressure band
Reducing the pressure effectively decreases energy consumption. For each 1 bar (14.5 psi) decrease in pressure, energy consumption is reduced by 7%.
Also, lowering the system pressure reduces the impact of leaks. A 1 bar pressure reduction decreases the impact of air leaks by 13%. That’s why the cascade method used in many compressed air installations is not the best way to regulate the system pressure. In a cascade system, the start/stop and load/unload of the compressors is controlled by means of a pressure band, resulting in an effective working pressure well above the minimum required pressure. This is highly inefficient. A central controller can regulate the system pressure much more accurately based on multiple parameters and sophisticated logarithms.