As I recall from that article, the Insight really doesn't use EGR that often at all. In steady state cruise it isn't used at all. I'm guessing it is only used during moderate engine loads during acceleration. Its kind of a different beast than a normal ICE being that its hybrid, lean burn, and uses EGR.
Edit: I found the quote.
Quote:
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In lean cruise, the Insight’s EGR valve is closed. At idle and under full throttle, the valve is also closed. In fact, in normal driving it is closed far more often than it is open. So when is it open? The valve is open its greatest amount (about 50 per cent duty cycle) at light and moderate throttle, at both low and high revs. It also opens when the car drops out of lean cruise to consume its stored NOx emissions (see Giving the Insight a Good Driver for more on the lean cruise behaviour of this car). Finally, it is open for a short time on throttle lifts.
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