You are correct, GS.

The suggestion that 4000 tankers bring foreign crude to east coast refineries is nowhere close to the truth. Most people's conception of an 'oil tanker' is probably a VLCC or a Suezmax, carrying 1-2 million barrels. If we step down to Panamax we're still looking at 500,000 barrels.
In any case, more than 10 such tankers per day to our refineries is clearly an impossibility, especially since the reversal of Line 9 and the unit trains of Bakken that keep rolling by.