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Mine runs mid to high 180s once fully warmed up. The thing is the Prius does a LOT more engine off coasting than the Insight, so the engine tends to cool down fast, especially if you want a little bit of heat or defrosting. I think this is why Toyota went to the exhaust heat exchanger on the 3rd gen Prius versus the coolant thermos on the 1st and 2nd gen. The exhaust heat exchanger can help keep the engine up to temperature in winter and provide heat to the cabin.
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