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I've wanted to do this with a few cars. Its just a bit of work to get it installed and working nicely.
I do think slapping on an EGR system will improve mileage. However, I think when you add tuning (ignition advance), you will see larger gains. There is also the issue of programming the EGR system itself.
All the newer engines are using cooled EGR so hot exhaust gases don't cause preignition when you use a lot of EGR. Otherwise, you get too much heat. This is the disadvantage to using VTC that Ecky mentioned. VTC doesn't allow the EGR to cool at all. However it is much simpler, and there is nothing to eventually clog up.
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