EGR is controlled more by Throttle than RPM.
I used to drive my 07 CRD thru the gears relatively hard IE give it a bit of welly and changing at 3500 to 3750 give or take.
I find most CRDs like to get up to cruise or speed limit fast then back off and just tonk along.
It easily got the best fuel economy doing this around town rather than driving Miss Daisy which returned crap figures
IMHO if you have a high power demand that probably holds the EGR closed or close to it thru the gears as you accelerate.





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