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Thanks for the suggestion(s). I'll check for the moisture. Plugs (Motorcraft platinums) & wires (8mm Autolites) & fuel filter replaced last sumer. K&N filter washed dried and reoiled (allowed excess to drain for 48 hours) last week.If you are looking to diag this, look for moisture (fuel) around the base of the injector. Also look at your fuel rail to check the upper injector o- rings. You will probably want to remove your upper intake and throttle body for a better look. Hope this helps. Decreased fuel economy could also be caused by a number of things...
1. plugs and wires
2. blocked fuel filter
3. retricted air filter
would probably be a good start.