Personally I'd be in favour of a second listing for EVs. In Wh/km or kWh/100km (the latter as it is similar to the metric L/100km measurement. I also think that the figures could be displayed in either metric or imperial based on your user settings, but that's another topic.
As far as the actual efficiencies. If you go any further than wall-to-wheels (or bowser-to-wheels) it gets awfully tangled. I'll leave it to the smarter people to sort it out. Though I note that my own EV will (eventually) be run on my own electricity generated at home. Most likely by solar, though only if I'm not allowed to put a wind turbine on my roof. Though I will concede that I'll most likely have a diesel generator backup just in case. The last thing I want is to have to call in sick to work because the power went out! haha
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Making do with a Honda Civic. Tesla Model 3 reserved. Still kinda want an SVX for fun, though.
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