Why a rated range instead of a rated efficiency?

[ewoodrick]

Why does Tesla advertise a rated range (250/310/325, etc.) instead of the energy per mile/km (220Wh/mi, etc.)?

If they advertised efficiency, people wouldn't be fretting over displayed miles / degradation, and it would be much easier to compare across all EVs, wouldn't it?

Because even though MPGe IS on the sticker, most people think that it's crap and no way it could be that good.

And the popular press has made range a big issues, although most cars rarely are even driven to their limits.

 

[emoore33]

Also I think you need to have a number that is bigger for better just like MPG in order for the general public to understand. If they quickly look at 28 vs. 42 they will think that the 42 kwh/100 mi is better. That's another reason why they came up with MPGe.