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It's rated at 34 combined on the new (more realistic) EPA ratings. I would hesitate to recommend replacing parts when you have no CEL.
If it was mine and I knew I was not getting the potenital mileage of that vehicle I would probably do what you are doing, making sure the maintenance is up to date, then I would probably replace the oxygen sensor if it was still falling short of my mileage expectations.
Your mileage quote was the original EPA, which was done at much lower highway speeds than 75 MPH.
EGR blockage will cause the ignition timing to be retarded which will affect mileage.
regards
Mech
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