Since the only real use of the EPA range is to make relative comparisons between cars, and since it will be very wrong for any car outside of the specific speed, geography, and season the EPA tests in, the EPA should choose some arbitrary number that is not miles. Then no one will feel misled when they buy electric, and we'll still be able to make range comparisons between cars.
General range barely ever matters anyway. ICE drivers thinking of going electric always ask about range, but over a certain minimum level of range what really matters is the estimation accuracy for a specific drive and the confidence that a planned charging location will be working as expected. If both of these are very good, the GPS travel time estimates will always be accurate and you don't really need to think about anything, which is how most people approach driving these days anyway: just follow the GPS.
The next thing that matters are the distance of chargers from the average route (we need more at interstate rest stops!) and the availability of 220V chargers at any place you will spend the night. The latter is the weakest right now, IMHO, but it's improving as more people go electric.