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1-2mpg gain
For shure a 1 MPG gain from the overhead Lie-o-meter numbers
Recycling spent exhaust gas back into intake manafold dont help cuz its been combusted B4 so there are no Molicules left to Burn from it.
Fresh air is the best and the colder the better (thus a CAC System) more molicules to burn basicaly a Better BOOM in the cylinders
They say there is less NOx (emission gases) produced with a EGR System because of lower cylinder temps. But you will get the same result from partly filling the cylinder with a NON Combustable Material vs lower cylinder temps.