Even in proper storage 87 octane gas can start to degrade in 3 months, 93 octane fuel should last closer to 9 months before degradation is noticeable. Keep in mind that 93 octane fuels are still susceptible to octane loss and vapor pressure decreases due to butane evaporation.
Octane stability in racing fuels is much different because fuel quality is valued more than production cost, unlike the pump gas industry where cost drives the majority of refining decisions. A large part of any quality race fuel is consistency.
Race fuels are designed to be high in octane to allow for increased compression ratios and boost levels. In order to achieve high octane and consistent composition, pure chemical components are mixed with highly refined gasoline. The components used in Sunoco race fuels are very stable and can retain octane in excess of 2 years when properly stored.
We have test results confirming octane stability in our unleaded, leaded, ethanol-free and ethanol fuels.
Please note this additive is degraded by sunlight and can lose all octane boosting properties within minutes of exposure L. Ter Haar. Degraded MMT will settle to the bottom of the container as a rust colored material that can clog fuel lines and filters.
Knocking occurs when the gasoline and air mixture ignites prematurely, making the piston bang against the engine headers. This premature ignition happens because the compression within the engine is high enough to ignite the gasoline without the spark plug. Fuels with a higher rating have less chance of causing engine knocking.
In high performance engines, that use high compression levels within the engine, the need for high octane fuel is critical. The lowest octane rating sold in most U.
The highest is usually Other ratings available include 88, 89, and What do all these numbers really mean? If you look at a gallon of gasoline at the molecular level, you will see chains of carbon and hydrogen atoms. These hydrocarbon chains come in various lengths. If there are seven carbon molecules in the chain, it is called a heptide.
Natarajan, D. Doyle et al. Understanding the Octane Appetite of Modern Vehicles. West, B. Huff, L. Moore, M. DeBusk, and S. Department of Energy and the U. Environmental Protection Agency. DOE and the U. Toggle navigation. Selling your car? We can help you advertise its mpg. Vehicles produce about half of the greenhouse gases from a typical U. We can help you calculate and track your fuel economy. MPG estimates from drivers like you!
Answers to frequently asked questions about octane. Enter vehicle or phrase. Selecting the Right Octane Fuel What is octane rating? What octane fuel should I use in my vehicle? So what do those different octane ratings at the pump really mean? Why octane ratings matter for your engine Gasoline-powered motors work by igniting a mixture of air and fuel at carefully timed intervals with a spark plug. Prior to each combustion, this air-fuel mixture is compressed, allowing its maximum energy potential to be extracted.
But because compression creates immense heat, a fuel must be able to withstand extreme temperatures, otherwise it can misfire prematurely. An octane rating is simply a measure of how heat resistant a fuel is in order to prevent knocking.
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