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Old 09-23-2012, 11:19 AM   #4
Andrews-bad-SE
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Thanks guys! I got a set of Motorcraft SP-463's coming now. Here's a related question... I've heard that fuel economy drops when using a copper plug. But the copper plugs are hotter, resulting in more fuel burn. Why is this? I mean, I'm not really that worried about losing an MPG here or there to make a little power, I was just wondering why that is.
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