Octane Enhancement

Enterprise owns a state of the art gasoline additive production facility that has been modified to produce isooctane, a motor gasoline octane enhancement additive used in reformulated motor gasoline blends to increase octane, and isobutylene. This facility is located in Mont Belvieu, Texas and produces isooctane and isobutylene using feedstock of high-purity isobutene, which is supplied by our isomerization units. Prior to mid-2005, the facility produced methyl tertiary butyl ether (“MTBE”). We modified the facility to produce isooctane and isobutylene. Depending on the outcome of various factors, the facility may be further modified in the future to produce alkylate, another motor gasoline additive.