WTI is a light crude oil, lighter than Brent Crude oil. Coal liquefaction emits more carbon dioxide than liquid fuel production from crude oil. Base oil is produced by means of refining crude oil. In addition to crude oil exports, Iran exports oil products. Roughly of gasoline is derived from a barrel of crude oil. Production of gasoline is achieved by distillation of crude oil. Hexanes are chiefly obtained by refining crude oil. Oil obtained by refining crude olive-pomace oil. It specializes in production of synthetic crude from oil sands. Kenya currently imports all crude petroleum requirements. The oil sands consist of large deposits of extra heavy crude. Burning of crude oil could also contribute substantially. "Bitumen" refers to the liquid derived from the heavy-residues from crude oil distillation. Texas has of proven crude oil reserves. Below is a schematic flow diagram of a typical crude oil distillation unit.