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Thanks for the concern Olympiadis (I honestly didn't read everything you posted, but did some), but I'm completely sure that EGR can in fact be used to increase mileage. Its already proven that EGR can improve power output by allowing more advanced timing and I don't recall exactly, but I imagine mileage as well. The fact that has yet to be tested is just how much mileage can be gained by it.
Anyway, I worked on my EGR circuit again this weekend. I had disassembled it since my tinkering with it last and found out the mosfet I was using had been fried. I have since gone to a higher voltage mosfet and also added a transil diode to help protect the mosfet.
With the circuit mainly done (need a hand dial-able pot and to wire it all up nicely for the car) all I have left to do is the physical work to the car. I hope to get the manifold modified in the near future and go ahead and install the EGR and block heater stuff together since it all requires dealing with coolant lines.
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