Regarding the drive power of air compressors

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I’ve just started working in the field of air compressors, and I’m having problems with calculating the drive power. When I use formulas to determine the actual drive power, the values differ significantly. What could be the reason for this? It seems that what’s indicated on the compressor’s nameplate is the exhaust volume The customer says they need an air compressor with a capacity of 20 cubic feet per minute. Should the compressor be chosen to have an output equal to that value, or should it be one size larger? The compressor’s nameplate indicates an exhaust volume of 20 cubic feet per minute at 0.8 Mpa; the motor speed is 1475, and the efficiency is 0.9. I would appreciate it if someone could help calculate the required drive power. Please provide the formula so I can check for any mistakes I might have made. Thank you