It would be interesting to know what is the maximum regen power they will get and what is the net capacity of the battery in kWh. Maybe it has been provided already somewhere? It would be an interesting thing to show, what is the % of the battery and what is the current regen power and regenerated energy in a sector/braking etc.

In a trip in Norway with a Kona EV I managed to regenerate 5 kWh in around 15 km when descending from 1300 m a.s.l to 9 m a.s.l (the road from Turtagrø to Øvre Årdal). Kona allows a maximum 150 kW charge to battery when recuperating (measured with an OBD dongle), Taycan should allow up to 300 kW if I remember correctly. But as the Rally1 battery is probably quite small I believe their maximum regen power is lower, otherwise the C would be very high and the battery longevity would suffer.