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In sohc engine i saw an increase when going from copper to platinum(autolite, in my escort i saw a 10% increase(30mpg to 33mpg with only thing different plugs and i had done a tune up 10k before with copper)). In dohc enignes and motorcycle/scooter engines i have seen an increase by going to ngk iridium plugs. In the bikes the electrode doesn't dirty ecause of how small it is, each spark cleans off the end so they run alot better than standard large electrode plugs. Check ebay, i got 4 ngk iridiums for about 22 shipped.
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