what is in mobile gas station special gas that make it special?

Answer 1

Nothing!!
All gasoline comes from the same pipeline and goes to the distribution points for all the different MARKETERS exactly the same.
However, each brand-name may use a proprietary blend of chemicals to do things like keep injectors clean etc. Some use one chemical and another might use yet another.
Gasoline is gasoline. The only real difference is octane rating, and they all use the same formula to determine the rating.