[aerohead]

As others have already mentioned,the platinum plugs are long-lived,and that's their singular distinction.They obtained cult status in the 1970s when Porsche began using them in the 911.Porsche did not choose them as a "performance" enhancement,but rather to defray costs to customers saddled with very expensive labor charges during tuneups.The platinum plugs lasted many times longer,which kept customers more happy,and driving Porsche cars more longer.-------------- Skip the iridium.I believe you'd be disappointed.------------------ Delco does produce a gap-less,rim-fire type plug which has been scientifically-proven to improve mpg by about 1.5% maximum.------------------ You would have to keep extremely accurate data under constant driving and weather conditions to see benefit from such an addition to your engine.As always,purchase at your own risk.