Hello, let’s assume from the following example: A standard petrol engine with knock control is designed for 98 octan petrol (= the manufacturer says that only 98 octan is the rated power). If you drive this engine with 100 octan or higher you have no increase in power compared to 98 octan, because the engine control is designed only for 98 octan. But: A change of 8°C in the intake air temperature has a similar effect as the change in the octane number. At 33°C intake air temperature you drive the engine with 98 octane. It achieves its nominal power, the ignition angle is not corrected. If you drive it at 33°C intake air temperature with 97 octane, the ignition angle would be corrected, so you would have power loss. But at 25°C intake air temperature you could drive it with 97 octane without power loss and without ignition angle correction. That would mean in reverse conclusion that from a certain intake air temperature one can Gasoline with 100 octane or higher could have meaning. Although no increase in performance, but at least the maintenance of the rated power. Am I correct? And if so, is there a standard that says that engines have to reach their rated power up to an external temperature of XX°C? (with the petrol required by the manufacturer) Or can any manufacturer act at its own discretion?