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