How about we do it more like the EPA does it to some extent. Every type measures in whatever convenient form. MPG Miles/CuFT centiL/Km Miles/Kwh or whatever. And list cost per year, 15000 annual miles at the avg price of fuel used by the vehicle. And the total yearly estimated carbon footprint.
That would be about the only sane way to measure things. Still not a direct comparison but close enough to get the general idea.
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