The required fuel is premium 91 octane unleaded. SkyActiv turbocharged I4 gasoline engine that produces 227 horsepower (250 horsepower on high octane fuel). It also has 2 CCRs producing Unleaded Petrol of High Octane. High Octane fuel is also more expensive. Torque stands at on 100 octane fuel. Use of gasoline with lower octane numbers may lead to the problem of engine knocking. They featured modifications to deal with low octane fuel and high altitudes. Power differed for cars with catalyzers, or for markets with lower octane fuel. From pentane to octane the alkanes are highly volatile liquids. Hence, pentane, CH; hexane, CH; heptane, CH; octane, CH; etc. Edge took overall first place on the Jetstream and Octane benchmarks. "n"-Heptane is defined as the zero point of the octane rating scale. Its larger counterpart is the SGI Octane. This work was the origin of the octane rating scale. It is one of several isomers of octane (CH).