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this is my go-to list when i encounter poor mileage:
tire pressure
wheel alignment
dragging brakes
extra cargo weight
ignition timing
air filter
dizzy rotor
dizzy cap
spark plug wires
spark plugs
vacuum leaks
correct vacuum routing
reading through this thread, it looks like you've already covered most things on my list. i would still check for dragging brakes though (jack up each corner and spin the wheel—it should spin with minimal resistance), wheel alignment, and vacuum leaks. did you mention if you looked at the spark plugs? i think i saw that the cap and rotor were replaced recently.
good luck.
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