Of the more than 17.3 million barrels per day (bbl/d) of refinery capacity located in the United States as of January 1, 2012, about 44% (or nearly 7.7 million bbl/d) is located along the Gulf Coast.


http://www.eia.gov/todayinenergy/detail.cfm?id=7170
http://www.eia.gov/todayinenergy/detail.cfm?id=7170