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Hey man...
I used to install upgraded plugs (Bosch +4, Beretta GTZ Quad-4, specifically and other cars) but didn't really notice a huge difference in performance and economy.
The trick is to compare this particular brand of plug vs. new stock plugs. You also mentioned 91-octane. Is that new as well? I did the same with the higher IATs, coolant temps, and advanced timing. I had a pretty big bump with those three and new wires. Don't forget Seafoam!
Long story short, it's hard to tell if the design of the plugs made the difference or any other variable. Nevertheless, it improved!
-Rick
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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