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Oh, did not know about EGR cooler. Thanks for the info. Regarding low rpm operation though, that "basic operating line" that they give, I am fairly sure it typically runs near the lowest rpm part of it because if you calculate the approximate cruising power required at say 60mph, it's around 80 Nm at 1000rpm (I don't like explicit hp calculations, I just multiplied through by a lot of ratios comparing with other cars). I believe the Prius is supposed to cruise at max efficiency on the highway.
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