I was interested so I ran the math myself.
Hp = RPM x torque / 5252
48.61Nm ~ 35.9 foot pounds
3710rpm x 35.9ftlb / 5252 = 25.36hp
25.36hp = 18,918 Watts
18,918watts / 18,884watts x 100
=100.1% efficiency???
My first thought is that the torque measuring device is inaccurate. Whatever sensor is inaccurate, its only about 5% off.
I know that Open PPG has worked almost exclusively to get there motors from MAD components and I believe that the open ppg motors are fairly high quality. Also everything I have heard about them points to them being a fairly reputable company.