Only reason I am not 100% sure about running rich is that I was getting this mileage before when I had 0.10ppm on HC.

I will do a little catchup on the ignition system -- Rotor + Cap, BP5ES (BP5EF) plugs, and splice in a new Bosch 13953 O2 sensor since all those items are at or very near recommended change intervals.

Duxthe1: I had the fuel distrib + eha rebuilt by larry @ CISFlowTech 2 years ago so I can guess everything with those 2 items should be OK. I guess I will run a fuel pump volume test to make sure everything pump-side is OK. Once all that is done, I will check mixture and make sure its not showing rich as you suggest.

Duke -- I thank you for the help at the prior emissions. I managed to get it to pass with the R16/1 shorting...but BARELY. Shorting it did not give me huge differences, so this time around I left it alone to see how she would do as-is.
I am also concerned about the Magnaflow cat. I had it installed in 2008...so its been 5 years and I do not have any precats so its fronting everything itself. Its a dang shame you can't "just" buy the OE cat and install it -- you have to cough up $2k for the entire pipe which I just simply cannot afford, nor is it cost effective.

Plan is to do the above, and then gauge results afterwards to see if I should get the Magnaflow replaced. Sucks emissions is a little bit of a crapshoot since everything is somewhat inversely proportional so nothing is ever 100%.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k