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What is the difference between 87 and 91 octane?
The higher the fuel octane rating, the less noise will be noticeable on combustion. Additionally, octane levels also reflect the fuel鈥檚 burn-rate. Regular 87 fuel burns slower than Premium 91 fuel, which will burn hotter and create more combustion.
What does octane rating mean in gas?
Octane rating is the measure of a fuel’s ability to resist knocking or pinging during combustion, caused by the air/fuel mixture detonating prematurely in the engine. In the U.S., unleaded gasoline typically has octane ratings of 87 (regular), 88鈥?0 (midgrade), and 91鈥?4 (premium).
What is the highest octane gas you can buy?
The higher an octane number, the more stable the fuel. Retail gasoline stations in the United States sell three main grades of gasoline based on the octane level: Regular (the lowest octane fuel鈥揼enerally 87) Midgrade (the middle range octane fuel鈥揼enerally 89鈥?0) Premium (the highest octane fuel鈥揼enerally 91鈥?4)
Can I use 85 octane fuel in my car?
This is not true for modern gasoline engines. So, unless you have an older vehicle with a carbureted engine, you should use the manufacturer-recommended fuel for your vehicle, even where 85 octane fuel is available.