Patent ID: 8536389

Claim:
An unleaded blend composition having a Motor Octane Number (MON) of at least 80 comprising less than 42% of aromatic compounds, and at least 2% (by volume of the total composition) of component (a′), which is a substantially aliphatic hydrocarbon refinery stream of MON value of at least 85, at least 70% in total of said stream being branched chain alkanes, said stream being obtained by distillation from a refinery material as a-cut having Initial Boiling Point of at least 15° C. and Final Boiling Point of at most 160° C., said Boiling Points being measured according to ASTMID2892, and at least 5% of at least one paraffin, aromatic hydrocarbon compound or olefinic hydrocarbon of b.p. 60-160° C., with not more than 5% of the total composition of hydrocarbon of by more than 160° C., and less than 5% 2,2,3-trimethylbutane or 2,2,3-trimethylpentane.