Introduced as a complement to VP’s popular C10 as an economical alternative that offers more resistance to detonation and substantial performance improvements over premium pump gas. In fact, tests in a crate engine showed gains of 3-4 HP and more torque than a competitor’s standard 110 leaded race gas! C9 burns very clean and won’t harm catalytic converters or oxygen sensors. C9 was chosen as spec fuel for many racing series in North America. A non-ethanol fuel, C9 is also an excellent long-term storage fuel.