Originally Posted by
fishboat
My read on Schwalbe's response is that the new Efficiency is basically a Supreme with new tread..which probably addresses a weakness in the Supreme...would make sense. It doesn't serve their purpose to eliminate a great seller and not replace it with a new and improved model that fits the same slot in their lineup.
FWIW Bicycle Rolling Resistance
https://www.bicyclerollingresistance.com/
sez the Efficiency does have lower rolling resistance, but less puncture resistance and was ultimately not as highly rated.