Oil tankers vary in size by a huge margin, from a few thousand tonnes DWT to 500,000 tonnes DWT.
The density of crude oil also varies, averaging around 0.7 kgs per litre.
There are 159 ltrs (apprx) per barrel.
From this you can calculate how much each type can carry.
An oil tanker would be carrying crude oil, not refined product. So the answer would be zero.
get lost it carrys 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000.1litrs
2 million barrels
2,000,000 barrels.
Assuming 1 metric ton of crude oil ~ 7.33 barrels them 20 metric tons of crude oil ~ 20 x 7.33 barrels =146.60 barrels of crude oil
About 5 million barrels of crude oil daily.
Seven barrels
The US produces about 5 million barrels of crude oil per day.
1000000
One ton of crude oil equals 7.3 barrels.
ALOT. 700mil barrels
In 2009, the US exported 15,985,000 barrels of crude oil.