For real world data,
I use exclusively 85 (regular). In travelling from 30F - 120F (in relatively low-zero humidity), from sea level to 11,000'. In the CA desert, one can do all those conditions in 1 day.
I have not had an issue with pinging and no issues. I am interested to hear what you find but it won't change the use of regular for me. Unless I get knocking or force induce my engine... the worker bee gets the cheap stuff and will like it mister!
