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Its hard to say. I normally don't use it in summer time. With the coolant thermos on my 2nd gen Prius my coolant temp is around 100F by the time I leave my driveway. In winter I use it to negate the cold weather penalty more so.
If I had to guess, I'd say it gives a good ~20% increase in those 5 minutes in winter, probably more like 10% in summer.
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