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The United States tends to produce lighter crude oil and import heavier crude oil

Lower 48 states crude oil production by API gravity
Source: U.S. Energy Information Administration, Monthly Crude Oil and Natural Gas Production

In 2018, total U.S. crude oil production grew by 17%, led by increased production of relatively light, less dense crude oil. The increase in light crude oil production is largely the result of the growth in crude oil production from shale and tight rock formations, which are now more accessible because of improvements in horizontal drilling and hydraulic fracturing.

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