Your vehicle should perform at its best when the appropriate level of octane is being used for the engine in which it is being combusted. There is no benefit to using gasoline of a higher octane than the engine requires to perform knock-free. I would go with manufacturer recommendations at the octane level indentified, and based on the performace of your vehicle engine, make adjustments in octane rating from there. 91, 92,93 ,94.
Informational
What do different octanes mean?
Different types of gasoline are rated on their ability to resist knocking. The actual octane number is a measurement that gauges the gasoline's ability to resist knocking. Higher octane levels indicate anti-knock potential. In most cases, light pinging or knocking will not cause power loss or severe harm to vehicles. However, heavy or prolonged knocking may cause engine damage and should be checked by an automobile mechanic.
How do I know what octane is right for my car?
Check your vehicle owner's manual for the manufacturer's recommended octane rating. Unfortunately, the manufacturer's recommended fuel octane level does not always guarantee that a vehicle will perform absolutely knock-free. Due to normal production variations, there can be noticeable differences among engines, even of the same make and model. If your vehicle experiences heavy knocking while using fuel at, or above, the recommend octane level, we suggest you have your vehicle serviced.