10. How much U. S. oil demand is represented by the large oil tanker?

Base on my research, as of 2004 The U. S. devours about 20 million barrels of oil a day, according to the CIA. But base on Wikipedia, it says that a normal large tanker can only carry around 2 million barrels of oil. So to supply the U. S with this oil per day, it needs 10 normal large oil tankers.