What is the current equivalent of 93-octane gasoline?

[DiKingston]

93-octane gasoline is now equivalent to 92-octane. Standard gasoline consists of isooctane and n-heptane. Isooctane has good anti-knock properties, with its octane rating defined as 100; n-heptane has poor anti-knock properties and is prone to knocking in gasoline engines, with its octane rating defined as 0. If gasoline is labeled as 92-octane, it means that this grade of gasoline has the same anti-knock properties as standard gasoline containing 92% isooctane and 8% n-heptane. Gasoline is a volatile, flammable liquid hydrocarbon mixture obtained from petroleum through distillation or cracking processes, primarily used as fuel for spark-ignited internal combustion engines.