Take a macro view of it: during the course of a hypermiler's trip, how many other vehicles barrelling along come up on a hypermiler doing extreme P&G or something and due to conditions or them not realizing what is going on, hit the brakes, de-activate the cruise control, slow way down (or not) and accelerate to pass again. Here we have one vehicle- the one that probably would be getting the best FE out of the lot of them at steady state cruise- potentially causing dozens or hundreds of guzzlers to interrupt their gait and guzzle even more... potentially causing more fuel useage than if the "hypermiler" went with the flow of traf f***! Of course if the hypermiler has the road to himself he is saving fuel compared to steady state cruise, or beating on it.
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