How Wh/Mile was calculated in Teslafi?

Was Wh/Mile on Teslafi calculated  based on the driving behavior or the Batter capacity?

In May, my Wh/Mile on Teslafi is 220 Wh / mile so far, however it is 206 Wh / Mile from the odometer tab on the car. I know 206 Wh / mile was based on my driving behavior. Not sure why Teslafi is showing a different efficiency, slightly lower?

Thanks