Oil Tanker

What is the size of the average oil tanker? The largest supertanker?

I just read today that the US is importing 12 million barrels of oil per day. I want to calculate a rough estimate of how many tanker loads that takes. If someone knows where I can find exact numbers of tanker arrivals I would be thrilled!
I should have worded the question: What is the CAPACITY of the average oil tanker?

To carry a large amount of oil, tankers are designed to be quite large. The Exxon Valdez was considered a midsized oil tanker measuring 967 feet long and 166 feet wide. In comparison, the largest tanker in the world, the Jahre Viking, formally known as the Seawise Giant, is 1504 feet long and 226 feet wide. These vessels are so large that crew members often use bicycles to travel from one point to another on the ship.

How its Made – Oil Tanker Ships