No but I talked with a rep and he said that AO Smith does not publish their efficiency data directly but he did say that the numbers in the CEC database are probably correct. He also confirmed the 20% improvement noted in the brochure. Theoretically, a low speed 20% efficiency improvement is predictable with the addition of a run capacitor. A typical two speed motor does not use a run capacitor on low speed so the efficiency of the motor is about half of that on high speed. Because the motor is significantly underloaded due to the speed change, the power factor is quite low so there is quite a bit of I^2R losses in the motor. The run capacitor shifts the current more in line with the voltage so the power factor increases and total current decrease improving the efficiency of the motor. But again, this efficiency improvement is only on low speed.