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A BSFC map only concerns itself with engine operating parameters and the fuel efficiency. There are similar electric motor maps, but they are much flatter, mostly varying only between 80%-95% efficiency.
As you point out though, it would be helpful if owners had access to some basic map showing what to expect at various temperatures and speeds. It could only be used as a rough estimate though, because there are lots of factors, like if someone preheated their car before they left, or headwind, which hardly anyone has access to that information.
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