This data-file tabulates the energy intensity and resultant CO2 intensity of the US refining industry, source by source, year by year, back to 1986.
Emissions of refining a barrel of crude in the US have fallen at a 0.5% CAGR over the past c30-years, from 36kg/boe in 1986 to 31kg/boe in 2018 (a temporary trough, before the disruptions of COVID).
US refineries are increasingly fueled by natural gas and merchant steam, while own use of oil, coal and oil products have been phased out.