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I agree, we should stay calm. There is no reason we can not discuss a very interesting (IMO) topic without getting all bent out of shape.
Of course EGR isn't a magic bullet, and its certainly not the ultimate solution (as if there even is one, haha). But, it is proven to increase fuel efficiency. That is why I posted the SwRI testing because you claimed "increased EGR for economy gain is as much of fable and legend as HHO." This simply isn't true. OEMs are using EGR in production cars today to increase their fuel efficiency and keep emissions in check.
That all said, EGR has its benefits and its downsides. Yes, increasing EGR reduces BSFC and BMEP. But it also reduces pumping losses and allows you to optimize ignition timing under higher engine loads. These are all trade offs. So, you have to find the balance between the two. Its not like you just start pumping it in and bingo bango you got a 25% increase in FE. Just like all things engine related, it must be tuned.
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