So much for "not enough refining capacity" propaganda.
If tankers are being turned away, then that supports the idea that there isn't enough refinery capacity. If there was enough capacity, they'd take all the crude they could get, unless they were intentionally limiting stockpiles of refined product.
In this case, stockpiles of refined products going unsold(warm weather & less travel) has slowed production.
There's only so much storage space available.
There's no shortage of refining capacity, never was, never will be, . . . but don't tell anybody.