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The Prius doesn't DFCO when it starts up do to long periods of regen. It high idles the engine until coolant reaches 130 degrees. It is never running the engine AND engine braking unless you shift to L.
I know all this because I watched coolant temperature, MG1 and MG2 power, closed loop, fuel consumption, among dozes of other things. Plus, you can simply hear the engine high idling and contributing no power to the car or deceleration.
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