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If my understanding of the Prius' powertrain is correct, EV mode should be physically possible up to the top speed, provided the motor can produce enough power to move the vehicle at that speed. The main motor is always spinning when the car is moving, whether the gas engine is on or not. I assume that the cutoff speeds are the point where the motor either can't move the vehicle on its own (in most circumstances) or that it uses too much power to have any kind of range. With a decent size battery and a controller that would allow it, I think the Prius could function as a 100% EV at any speed possible with the gas engine (as long motor can put out enough power to overcome the drag).
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