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+1 for OEM plugs, especially in a Honda. Not sure why, but I would say 95% of the misfire complaints I dealt with were the result of aftermarket (Bosch, Autolite, Mighty, Champion,..) plugs. The other 5% was worn standard OEM plugs.
Honestly I can't say I've done any comparisons as far as economy or performance goes to compare the different types of plugs. I can say though that the Iridium plugs last a really long time! I think alot of it has to do with manufacturers trying to lower the cost of ownership for J.D. Power ratings.
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