I imagine if their engineers were any good the mph number would collect data on the user's past trips and make increasingly better estimates in the future about the translation between kWh and miles for the specific user.
Obviously a user in Kansas would get more miles per kWh than a user in the Swiss Alps but the vehicle has data on where all the user has driven and how many kWh were used at every instant since it was purchased.
I think that value for the charging speed is really important enough scale.
Meanwhile, there are a few ways to view battery charge:
- miles of range remaining (the default)
- ideal miles of range remaining
- percentage.
Turns out, percentage is a much more rational way to view battery charge. Charge to 70% or 80% is absolute and graspable.
Charging to range is variable and not really that helpful. Maybe if you are a really consistent and conservative driver it would work for you, but I've found it to be unpredictably inaccurate and leads to confusion.
Obviously a user in Kansas would get more miles per kWh than a user in the Swiss Alps but the vehicle has data on where all the user has driven and how many kWh were used at every instant since it was purchased.