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EGR is fine
It looks like I'm seeing an MPG improvement after the AAP vacuum line plug, especially for this time of year. I still feel the engine is subjectively smoother. Later on I'm going to reread the plugs, too.
In other news, I ran an EGR test today. It's working fine. Test method: using a hand vacuum pump with gauge to verify a) the EGR valve diaphragm holds a vacuum, b) the engine dies if the EGR is opened manually during idle. Separately, I verified that the EGR diaphragm moves when the engine is reved. That about covers it?
So apparently my hunch was wrong, no EGR fault.
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