Quote:
Originally Posted by johnlvs2run
It seems to me the faster acceleration with platinum or iridium plugs would result in shorter pulses for each coast, and thereby better mileage. If not, then they must burn more gas to get the faster acceleration, which becomes a tradeoff. Why would iridium plugs increase emissions or affect valve timing?
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Actually, iridium plugs would burn the same amount of fuel more efficiently, then it would lead to faster acceleration, it doesn't have nothing to do with valve timing. And wouldn't actually increase emissions.