What Octane Fuel Should I Use? 


What Octane Fuel Should I use for my Toyota?

My people are under the impression that it is beneficial to use a high octane or premium gasoline (90 or higher octane) for their Toyota. The fact is no Toyota, (Other than the Toyota Supra that has a BMW engine) uses a grade of gasoline above higher than 87. The electronic control module of most Toyotas is tuned to 87 Octane.

Many people believe that opting for a higher grade gasoline will improve the performance of your car, but this is not so. Gasoline ratings have been determined on the basis of octane; 87 octane is regular, 89 octane is mid-grade and 91 or higher octane is premium. The octane ratings are not an indication of performance, but instead, indicate the fuel’s resistance to pre-ignition.

The engine of your Toyota operates with a mixture of air and fuel. You can get more power if you increase the compression of this mixture before it is burnt. However, this will cause premature ignition of the fuel, known as pre-ignition. So when you are using a higher grade gasoline, you are just increasing the resistance to this pre-ignition and not deriving more power.

Pre-ignition can damage engine, and fixing it can be pretty expensive. Modern engines are equipped with sensors that can take care of pre-ignition and minimize the damages, but there is a still a slight chance.


So, bottom line is stick to the recommended 87 Octane. That is peak efficiency for your Toyota.