Hi, I have the opposite issue, and think this is due to the curve used by Zwift to convert speed to power. Speed to power from other applications or published curves for the Elite Qubo Power Fluid:

**Elite**

Speed of 30 km/h = ~325 W

Speed of 42 km/h = ~600 W

**Powercurve sensor**

Speed of 30 km/h = ~350 W

Speed of 42 km/h = ~800 W

**Trainerroad**

Speed of 30 km/h = 304 W

Speed of 42 km/h = 656 W

**Zwift**

Speed of 30 km/h = 384 W

Speed of 42 km/h = 968 W

That leaves a considerable amount of variation from the mathematical function used to convert speed to power.

Speed of 30 km/h = 304 to 384 W

Speed of 42 km/h = 600 to 968 W

Are the curves published by Maurizio Gigliotti (in the Zwift link above) really what is implemented? On which calibration did Zwift base these? The higher wattages on Zwift compared to Trainnerroad matches what I have tested using both applications simultaneously, so I would be surprised if these are not accurate.