Swapped out plugs with new stock Champions (no double platinum's nor iridium's). 35K miles none measured over .048 vs. new at .043. Will go 45K next time. Good to go in there anyway to clean everything up. Always 89 Top Tier fuel, 5K OCI's, and Redline S1 or Techron Complete Fuel System cleaner at each OCI. 2 of the 16 plugs right out of the box had virtually no gap. Makes one wonder about Champion's quality control. These were double packed 4 to a carton from the factory.