The ends justify the means, eh ? ;-)
I have yet to find utility in MPGe if a gasser is compared to an EV:
It says nothing about relative fuel costs;
It says nothing about relative tailpipe emissions or CO2 pollution
And if you want a cheap laugh, read how people mangle MPGe in plug-in hybrids. E.g., C&D, which has still not figured out that electricity consumption should be included in hybrid mode.
It’s not supposed to tell you about the cost or emissions.
It is there to allow comparisons between EV and ICE in a very easy and familiar way.
I have yet to hear of a better way that doesn’t require mathematical gymnastics.
As for cost and emissions, those points are listed on the Monroney sticker. Granted, the cost is based on US averages, and the emissions are woefully simplified, but that information is there.
Why some people insist that a ruler is terribly because it doesn’t measure weight I just don’t know.