The wasted spark system, where 2 plugs share one coil, one of the plugs have a reverse current flow, that reverses anode/cathode, and in a case of a single platinum plug, half of them will transfer the softer steel to the platinum with the current, eating away the plug faster than if it was just plain steel on both sides.
You need to use double platinum, where there is platinum on both sides of the spark, with these kinds of ignition systems. BUT, like people have been posting, for the Commander and other Chrysler vehicles, with this kind of ignition, some have found that other than the specific OEM plug can NOT be as reliable or cause problems.
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