The only demos I've seen are for motors with no load at all. If a product is designed properly, the motor will be sufficiently loaded that little energy savings will occur.
Don't tell that to the public. On 60 minutes quite a few years ago, they interviewed a fellow who installed one on a window shaker air conditioner. He claimed that his energy bill went down about 50% and that the window shaker had become so efficient, that he had to turn the temperature control up so he didn't get cold.
The "theater of the mind" effect.
Frank
