Getting ready to tuneup my 93 civic dx hb and am curious: Do more grounding electrodes make a difference? Are 2 better than 1 and are 4 better than 2? I do feel there would be an advantage for having the platinum. With these 100,000mi plugs, has anyone heard if they are still effective at 50 or 75000mi? Thanks! Rick
Civicrick 
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