Cracking is used in petroleum to form `` light '' products such as LPG and gasoline . Oil refinery cracking processes allow the production of `` light '' products such as liquified petroleum gas ( LPG ) and gasoline from heavier crude oil distillation fractions such as gas oils and residues . Fluid catalytic cracking produces a high yield of gasoline and LPG , while hydrocracking is a major source of jet fuel , diesel , naphtha , and LPG .