"... research showed that participants did not understand the concept of a kilowatt hour as a measure of electric energy use despite the use of this unit in their monthly electric bills. Instead, participants favored a miles per gallon equivalent, MPGe, as the metric to compare with the familiar miles per gallon used for gasoline vehicles. The research also concluded that the kW-hrs per 100 miles metric was more confusing to focus group participants compared to a miles per kW-hr."
The fact that people find inverse consumption less confusing than consumption seems to indicate the they never actually do any calculations based on that number...
The problem with MPGe is that, while it makes for a nice number to compare to ICE vehicles, it entangles things like the average national efficiency of power plants with the energy consumption of the car, so it's impossible to calculate e.g. how much it will cost me to drive to work every day or how large a PV setup I need to supply my commuting energy need.