The United States continues to increase production of lighter crude oil
As domestic production continues to increase, the average density of crude oil produced in the United States continues to become lighter. The average API gravitya measure of a crude oils density where higher numbers mean lower densityof U.S. crude oil increased in 2017 and through the first six months of 2018. Crude oil production with an API gravity greater than 40 degrees grew by 310,000 barrels per day (b/d) to more than 4.6 million b/d in 2017. This increase represents 53% of total Lower 48 production in 2017, an increase from 50% in 2015, the earliest year for which EIA has oil production data by API gravity.