Reducing the gap from the MGR spec down to 0.5-0.7mm is frequently found to fix hesitation when accelerating, but if yours is fine as it is, it's not necessary. I reduced mine to 0.7mm when I last changed the plugs, but I had no specific reason to do it. I'd read all the threads and simply thought, why not? As vehicles get older, there's a natural tendency to experiment and vary away from what the manufacturers specified. But many of the reasons are arbitrary I suspect.
TC
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