Mismatch between TeslaFi and car report

Hi.
I've noticed that the energy use rate doesn't match between the TeslaFi site and what the car report.

TeslaFi is constantly reporting a lower value, up to 10Wh/km lower.

Like for my last drive, TeslaFi reported 172Wh/km while the car shows it was 180Wh/km

Is there an explanation for that? Are the numbers reported measuring a different thing?