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Spark Plugs

Has anybody heard the rumor that in some older cars, that platinum spark
plugs can actually _reduce_ the mpg's and power of an engine?  I've got
really crappy gas mileage (See related message; Subject: New member to list)
and I'm considering going back to the Bosch triple electrode/copper cored
plugs that were in the car when I bought it.

Thoughts anyone?