Most of America's refineries are set up to process heavy crude oil (<30 degrees API), found in Venezuela, while vast majority of oil produced in U.S. is light crude (>40 degrees API); U.S. refineries can't process most of oil we produce, and overhauling these refineries would cost billions of dollars; as @StatistaCharts infographic shows, U.S. dependency on heavy crude has grown significantly in past 4 decades, representing ~67% of crude oil imported in 2024 vs. 13% in 1978, according to data from @EIAgov