Nick,
As you well know, the "complete" makeup of an oil is proprietary. It is well documented that Mobil 1 is a Group IV POA, below is the language from Mobil 1's site so you can read it with your own eyes (or are you now going to say that Mobil is fasely adverstiseing their product).
"All motor oils are made up of base oils and additives. In general, fully synthetic motor oils contain non-conventional, high-performance fluids, such as polyalphaolefins (PAOs). Semi-synthetic oils (also called "blends") usually use a small percentage of non-conventional, high-performance fluids in combination with conventional oil.
To meet the demanding requirements of today's specifications (and our customers' expectations), Mobil 1® uses high-performance fluids, including polyalphaolefins (PAOs), along with a proprietary system of additives. Each Mobil 1 with SuperSyn™ viscosity grade uses a unique combination of synthetic fluids and selected additives in order to tailor the viscosity grade to its specific application."
Now concerning Royal Purple, I cannot find on their website anymore where they state that in their API approved oils they use a blend of Mineral, Synthetic and Synerloc. Perhaps they have changed their formula or website since I last looked.
Concerning the filter change you stated "you can run the oil 8000-10,000 miles and change the filter halfway through and have no worries." I pointed out there are many factors besides the filter that could effect the oil on longer intervals. No you didn't recommend going to 20,000 miles, but even 10,000 is pushing it on a vehicle driven in cold weather, short trips, etc..
Finally, you make the lame assertion that I am a "mobil rep or I just don't like you." Before I didn't care and was trying to help in getting accurate information, now you have confirmed you are a

. As far as me a mobil rep, sorry, I don't do sales. But since you bring it up, you wouldn't happen to sell Royal Purple, would you?
Cary