Another update, finnaly got to make a round trip on the highway with the truck basically unloaded, 18.5 MPG or about 2 mpg less than my 1/2 ton with a 6.4 SRT8 would have gotten on the same trip. It never pings audibly or on the knock sensors in the data stream even on 87 octane and heavy loads where the SRT8 would rattle on anything less than quality premium fuel.

The 1/2 ton had 3.55 gears, less weight, less aeromatic drag, more compression, more cam and MDS

I really wish I would have run single layer real thin head gaskets to get more compression but it runs really nice as is. Much more low speed TQ with less high speed passing power.