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Nope. I'd say the number of documented cases where cleaner/bigger/additional ground straps help smooth out idle/increase performance/make for less electrical gremlins is large enough to count as reasonable proof that it does have an effect.
My theory is that clean grounds, having a lower resistance, have less voltage drop - so things are getting a little more power, helping them run "more properly," or that because there is less drop, the ECU doesn't 'overvolt' to compensate for the drop, so the current and voltage levels are smoother.
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