jstang, you should have gotten those codes with the engine off test as active codes as well as stored codes. What else do we need to know about your mods that you haven't told us as yet? All of my 2.3 Mustangs have averaged 25-30 mpg even in winter and some hard driving. Is your emergency brake stuck on? Do you live in a valley at the bottom of a 1/2 mile high hill? I'm afaid I'm at a loss at this point. Sorry.
Yes, the EGR function will affect mileage, but it is normally a valve not closing properly rather than the code you got for not opening properly. If you detach the EGR hose with the engine running and connect a hose directly from manifold vacuum to the valve, it should stall the engine. If not, clean the valve.
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