- Many refineries need heavier crude oil to maximize flexibility of gasoline, diesel and jet fuel production. Today, most crude oil produced in the United States is light, including much of what’s produced in the Permian and Bakken. Light crudes are not good replacements for the heavy crude oil we get from Canada and Mexico.
- Re-tooling refineries to process solely U.S. crude oil (light crude) would cost billions — a risky investment that would take decades to permit, construct and eventually pay off. We lack the infrastructure (like pipelines) needed to cost effectively supply U.S crude oil and refined products to every region. Even if the economics of re-tooling our facilities worked, it can take close to a decade to permit and build pipelines in the United States.
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How much oil does the United States import (and why)?
About 60% of the crude oil that runs through U.S. refineries is extracted right here at home. However, our refineries run on many different types of crude oil, some of which we don’t produce here or can’t economically transport. In those cases, we use imports.www.afpm.org
That's interesting, I know there have been several short periods in time the the US has been energy independent but I guess that could just mean they're exporting more than they're importing rather than refining all their own product.
I'm still puzzled as to why with such a massive refinery capacity, it's geared more toward a type of crude that isn't so prevalent, unless the refineries are quite dated and the product requirement has changed over the years, or possibly the type of oil has changed as older wells have dried up.
That would be an interesting thing to look into.

