You have at least one reader.


Bank to bank trim is an improvement but I wish there was a way to dial it in cylinder by cylinder, especially at highway cruise part throttle.

You changed 8 injector to get “in the ballpark.”
It would be good for MPG to give each cylinder the capacity injector it needs.

Having used an un-lit propane torch to find vacuum leaks,
I have wondered in the past whether adding a cheap flow gauge on a propane bottle, then tapping a small test port into each runner to add a measured stream of extra fuel when at highway cruise would allow finding rich or lean cylinders. Keep increasing propane flow until that bank’s Oxygen sensor registers a change.

Having a threaded test port on a individual runner also makes in possible to screw in a “ Flow restricter” to do the opposite: reduce airflow a bit to balance AFR in each cylinder.

Getting each cylinder near to 14.7 AFR would help MPG,
but taking all cylinders to 21 AFR would improve MPG even more.
Remember at +20 AFR tendency to ping or detonate goes WAY DOWN, just like running AFR below 10 suppresses pinging.