Self-report. I wouldn't necessarily assume that the people who have Stats skew towards more efficiency, because there are lots of reasons to get the app besides checking your efficiency. I got it to check my battery health trend, and various notifications and smart settings. I suppose the app developer may have an answer for whether the users skew towards efficiency.Does the stats app take data from all tesla or just those who self report? If it's only those who self report then the average is even more skewed towards hypermiling. I would guess a lot of drivers on the other end of the bell curve like myself (I am averaging over 350wh/m) are way less likely to use the stats app.