I'm pretty sure someone has made an engine blanket that wraps around the entire engine on either the Prius II or Insight I. I can't remember though. He was definitely running in in winter, not sure weather he was running it in summer though.
I'm seriously thinking about adding some insulation to the Prius. The coolant temps drop fast enough in summer with the engine off as much as it is. In winter, it'll definitely be beneficial to insulate.
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