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For the EGR thing I hate it and see it as a "necessary evil", or maybe if engines were tuned better it is an "unnecessary evil". Basically they are bad for engine longevity, where they may actually reduce fuel consumption is in the pumping losses, so if you connect the exhaust direct to the intake, as one cylinder is pushing out exhaust, another is drawing it in, like a closed loop, so minimal power is required in the transfer, but other factors come into it in the combustion cycle as to combustion efficiency. I don't know if it does improve economy, just read it somewhere a while back, I suppose my point was more that the ECU is doing a lot of things behind your back and what seems like a good move for economy may not always work out that way.
I got into this aero stuff after doing a lot of research on airflow through the engine bay for heat removal, and found both by reading & personal experience, what seems logical, is not always so and often you get a negative result from modifications if they aren't properly researched & tested.
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