I would get that in writing before I went by their specs. Now could we just not wait until we get an engine light at least or a knock or ping. What is the reason for needing to change the plugs so often and what about the higher compression engines ford and gm are putting out what are their plug change requirements? Is Dodge the only one using 16 plugs for 8 cylinders?

 

Another benefit to the 30K change is that they don't seize up in the aluminum heads.
I can understand the 30K on the copper plugs in my 08, but if they used a harder metal such as platinum or even nickel, it should be at least 50K. When I pulled the platinums out of the 01 F150 I had early at 79K, they were a worn about .005 or so. I'm not sure why they went with more exotic metal type plugs and kept the 30K interval. Copper is a better conductor.
72, I think that Dodge is currently the only domestic company that uses a dual plug set-up. The Hemi and 08-up 4.7L have dual plugs. On the Hemi, it is more for emissions reasons. The Hemi head design makes good power but isn't great as far as emissions are concerned so they added a second plug to help burn all of the fuel in the cylinders. Originally, the 03-05 used a wasted spark design that had a plug wire that ran across to the other bank so that it fired one of the plugs on the exhaust stroke. In 06, when MDS was added, they went with the dual coil pack and fire both plugs together.