HAs anybody tried copper or iridium plugs? I changed mine probably about 60k ago, but honestly I don't remember if I used platinum or iridium.
sparkplugs.com has a good selection of different options with denso iridiums @ $9.99. The NGK platinum is $12.99
I'm thinking I should do this again even though the car is running perfect as it sits. still pulls hard and idles fine. MPG is the same as it's always been.