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The coolant thermos is insulated fairly well. I park the Prius in my garage each night at around 5pm. When I start it up the next morning at 5am, my engine gets up to roughly 100F (38C) almost instantly.
Unfortunately, I don't have a scangauge right now or I'd get you actual numbers since it has been cooling off. I'm sure its a bit cooler than that now.
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