Wow, just realizing it has been 4 months since writing anything on this thread. I have done nothing else to the truck

seems to do everything I am asking it to. Daily driver, work on the farm, tote the camper, mild trails. I did get the timing belt and water pump done. I am at 166k and have no records of if it had been done.
Reason for the post is to report a bit of fuel mileage study. This is all with the camper loaded and highway mileage. I know there are a thousand factors, but not being a scientist or anything, this is good enough for my purposes. I am happy for you to give me your thoughts on this.
When I run regular unleaded 87 octane, I average 12.6 mpg. When I run Premium 93 octane, I average 14.6 mpg. Taking into account the difference in price per gallon, the 87 octane costs me $0.24 per mile, the 93 octane costs me $0.25 per mile. No great difference. I do get an increase of 52 more miles per tank (max) with 93. The last thing is that if I run the 93 on the highway, my CEL will eventually turn off. It returns when I either switch back to 87 or when I go back to prolonged surface street driving.
Interestingly, I get nearly no benefit from 92 octane premium, so it seems that the 93 octane is the tipping point.