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Silver as a material is the best conductor but mental price wise but doesn't silver have a lot lower melting point though?

Iridium is the harder alternative is more widely used in modern cars due to long term servicing schedules nowadays

both are probably a waste if you are checking/changing them as often as you should do though but interesting concept and if you believed all the hype you'd think no other plug would work at all mind
 
get some NGK copper plugs at the correct temperature rating and youll be a happy man.