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In theory the EGR does improve mileage by partially filling the cylinders with exhaust which is inert. Less oxygen means less gasoline burnt. This also means we have to open the throttle a little more to get the same power thus reducing pumping losses.
Attach a vacuum gauge to the vacuum hose going to the EGR valve and drive using less than half throttle and see if the vacuum solenoid is providing vacuum to the valve. The ECM will need to see warm coolant temp, vehicle speed & proper MAP sensor voltage before it will activate the solenoid.
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