The discussion of fuel economy in the EGR plate kit thread prompted a thought. The motivation of most to go into testing mode with the EGR is to eliminate gunk into the intake. Economy and performance are another potential motivation but no one seems to agree on tangible benefits. When my EGR somehow mysteriously plugged one weekend (someone must have put some sort of plate in it) I did not have enough of a baseline of fuel mileage averages to see any measurable difference.
The EGRs function is to give gasses a second opportunity to combust but is it also not designed to give FUEL VAPORS a second opportunity to combust?

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84 300SD 274K
38K miles on flatplate heat exchanger and various diesel/veg blends. prior to that 4K miles on unheated veggie blends with kero and DinoD.