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As a tangent thought experiment, EVs tend to get better efficiency the slower they go. However, some EVs are terribly inefficient at providing cabin heat to the occupants because resistive heating is used. That means a stopped car is still consuming a large amount of energy. There has to be some speed at which an EV is most efficient so it isn't spending a ton of time heating the cabin. Of course, there are many variables involved so there isn't a single answer.
I imagine there's some minimum speed in an ICE at which point going any slower is also inefficient. An engine at idle, for example, isn't very efficient.
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