The article explains how crude oil is turned into different fuels through refinery operations. It discusses the use of fuel additives to enhance fuel properties. Distillate fuels are produced in larger amounts than naturally found in crude oil. Alkylates are made by reacting short chain alkenes with isobutene. Refineries blend various distillate streams to create finished fuels. Middle distillates like jet fuel and diesel have higher boiling points than gasoline. Different additives, like detergents, are used in fuels for specific purposes.