While that's true, it's the same for ICE vehicles.
Does that mean that the efficiency of an electric motor drops off with speed in comparison with and ICE?
Figure 3 in Determining electric motor load and efficiency shows that current increases fairly sharply after 70% load.
https://www.energy.gov/sites/prod/files/2014/04/f15/10097517.pdf
2020 BRN Discussion, page-19756
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