I'm not 100% sure how the Nissan CVT works (I have driven in a newer Sentra with one), but it wouldn't make sense IMO to work any other way. The Prius works by first opening the throttle to maximize the load on the engine. If the vehicle still requires more power, it starts increasing rpm at that point. So, if you are noticing your rpms increasing you're already at an optimal engine load (you might be able to verify this with a scangauge), now you just control the RPMs for how much power output you want. This is pretty much what P&G does.
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