The nominal 3 H.P. fan motor typically is considered an an over motor (being mounted in the path of the cooling air flow created by the fan) and as such the motor will utilize a greater amount of the service factor; in this case about 25%and with an 89.5% efficiency that would equate to about 3.75 kW.

Total 89.75 kW or very close to the 90.4 kW stated in the CAGI sheet. The variation is covered by the +/- factors of the power test code.

Electric motors chosen for these compressors typically are rated for 90 deg. C rise at 40 deg. C ambient at service factor amps so maintaining proper cooling is very important to stay within motor temperature operating temperature limits so as not to cause premature motor failure ( insulation breakdown / motor burnout )

Your comment about choosing a higher pressure rating compressor and operating at a lower pressure would not be particularly wise. A fixed speed compressor would deliver less volume ( 450 CFM at 125 PSIG ) while consuming similar full load power. By reducing the operating pressure to 100 or 110 PSIG, less power would be consumed but the flow would also remain at the lesser rated level of 450 CFM so your specific power
( kW per 100 CFM ) could actually be no less ( and maybe greater ) than if you selected the 100 PSIG rated model with higher flow.