[Venturer]

I believe all of those products are shipped through the same pipeline now.They separate them with some sort of bubble, I think.

[thackney]

Transportation fuel is typically shipped through the same pipeline (gasoline, diesel, aviation fuel)

But refineries also will produce residual oil, petroleum coke, sulfur and/or wax, etc. These byproducts have an existing market near the existing refineries, or an established distribution system at the refineries. There is far greater cost to building new facilities, new pipelines and being farther from other markets compared to just building a pipeline.