When I first got my '04.5 Touring Coupe, out of sheer hard-headedness, I tried 89-octane gas for about 2 months; there was no knocking/pinging/dieseling. BUT--there's that "but" again!--I read an article in Car and Driver, where they stated that, even though the car may not knock/ping/diesel, carbon formation in the valves and the combustion chamber would ensue in just a matter of weeks! So, this hard-headed Puertorrican switched right back to 93-octane nourishment for my Zed! "He who has ears to hear..."
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