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Watt-Hours per Mile vs. Miles per KWH
Like many on the forums, while waiting for M3D delivery I'm reading and learning. One puzzling question keeps coming to mind after seeing numerous posts referring to the "wh/mile" metric. It seems backwards.
ICE vehicles have used MPG (miles per gallon) as the fuel efficiency metric for as long as I can remember. Miles is the travel distance and a gallon of gas or diesel is the fuel metric.
Just curious as to why folks are flipping the numbers around with EVs, i.e. using fuel as the numerator and travel distance as the denominator. I'm assuming there is a good reason why and would like to better understand.
What is the some underlying reasoning here? Wouldn't it make more sense for the EV market to stick to a fuel efficiency calculation everyone already understands?
For example, let's say the average M3 with the long range battery (with roughly 70 KWH usable capacity) can drive roughly 300 miles between charges. This would equate to a "fuel" efficiency rating of roughly 4.2 miles per KWH, right? Why would the market not use this more simple terminology rather than wh/mi?