I didn't do it my wife drive my truck and didn't know better
This is why, when I am not towing, I just use the 87 perf/tow tune. You can use higher octane gas than what the tune calls for without negative effects; but not higher tune than the octane rating of the gasoline. And really, I can't tell much difference between the 87 perf/tow tune and the 91 perf/tow; maybe when I hook up to a big load there will be a noticeable difference.
I got the 87 economy and perf/tow and the 91 economy and perf/tow tunes. I know I was able to get 5 but I had no use for a 5th tune so why bother. ANd now that I have had it for some time the economy tunes are pretty much a waste on the tuner too as I will never use them again after being wooed to the dark side with the perf/tow tune.