Join Date: Apr 2019
Location: Fort Lauderdale
This may not be available to the OP (citing km/hr means not in the US), but here at least, one could use the mile markers on the interstate for testing the calibration. Any speed could be used, but setting cruise control to a nominal 60 mph (or carefully manually maintaining it) and using a stop watch should yield 1 minute between them. (Otherwise: use slight math.)
Using dynamic mode gives access to the on-board lap stopwatch, for repeated mile segments, also. I don't know if accuracy at one speed means accurate at all speeds, but it probably does.
2019 I-Pace 400EV HSE First Edition
Corris Grey - Ebony/Ebony