just changed plugs in my 05/4.7. the stock champions had 25000 miles on them and the electrodes were almost all gone. installed the autolite platinum plugs and can say there is some difference in the the way the truck idles. seems smother than the stock plugs. they are a cooler plug then factory. anyone else using these plugs on there 05/4.7. if so have you seen a difference in performance or mileage?