I think it would be great to had a “manual fine tuning button” to the Zwift Footpod Calibration setting menu.
It could be a 1min fine tune calibration after run start, so you see your avatar running, and that would count in your session.
That would allow to dial the very exact speed to match the Treadmill speed.
For some reason, and even when re-calibrating before each session, Zwift reading of my running speed is always around +0.3 to +0.4km/h off my actual treadmill speed.
Please add some sort of “manual fine tuning” button, to improve reading accuracy and make running speed spot on.