I'm not really anticipating being a car buyer for another half decade, but the #1 thing I want to judge the industry by & see progressing is MPGe (or kWh per 100km elsewhere). How efficient is your vehicle? Leaving everyone to go figure out efficiency obfuscates what should be a defining characteristics of these offerings!
This is even less of a concern with electric vehicles, both because any electric vehicle is already more environmentally friendly (you can feasibly charge with 100% renewable energy regardless of MPGe), and because the energy cost will always be lower than it was for gasoline vehicles, which leaves even less monetary value on the table for possible gains from efficiency improvements.
So almost nobody is going to care about that unless we end up in a world where electricity prices are dramatically higher than they are now.