chinese 1.6 steel roller rockers & RHoads lifters

Well AJ , I could be wrong, but I wouldn't expect a 220ish at .050 with 110 LSA in a 360 to be super fuel efficient at 1300 rpm , fast rate or not. That might be asking too much. Sounds like it was a great overall package though.
You're not wrong.
I had to increase the cruise rpm to over 1600rpm to get high 20s mpgs in point to point running. I could tell you it got 32mpgs on one particular trip, but com'on nobody believes that.lol.
And yes it was a pretty good package, for quite a long time. Especially with 4.30s.
Eventually thou I got tired of HAVING to always split gears, on account of the engine wasn't fond of the A833od shift splits on their own which as you know are quite far apart. And splitting the GVOD at low rpm/part-throttle, the GVOD is not particularly accurate, and getting the clutching just right got to be a pita.
So when the lobes fell off the cam, I moved on; bought a smaller DD, and switched the car from DD to weekend warrior; and mpgs was no longer on my mind.
It was a great combo, for most of the time I had it.
Now, with the combo changed yet again, it's waaay better,lol.