Sounds like you all may have figured it out. I had a similar problem but only when the car was moving. Turns out if you have the "bladed" wheels the blades can come loose and click as the wheel turns, so another possibility to consider.
Range looking better!
Article: https://www.motortrend.com/cars/porsche/taycan/2020/2020-porsche-taycan-turbo-s-instrumented-range-test/
Test results summary:
Normal mode (one loop): 240/274/254 city/highway/combined miles
Range mode (two loops): 243/269/254 city/highway/combined miles