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Hersbird: The people that can say FU to the environment and fuel economy both are at the drag strip. EGR / OBDII controls allow for more spark advance, a cooler burn and the very best we can hope for if our environment counts for anything. The moment you start screwing with the air pump and other controls, the system starts throwing codes and goes into degraded modes of operation. Most of us are not in a position to remove the friendly to mother nature stuff and then replace the PCM programming to restore the vehicle to proper function, even forgetting the environment. Of course we could get better fuel economy without emissions controls, but then again, we haven't had 100 octane (generally) at the pump since I was teenager pumping gas, and that was a LONG time ago!
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