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Fuel FAQs
E85, mixing two fuels to reach an octane rating, and how octane ratings are listed.
What is E85 fuel?
E85 is a fuel blend that has been used for many years and has been common in U.S. automotive applications since 1998. The "E" stands for ethanol, and "85" refers to fuel that contains up to 85% ethanol. E85 has a higher octane rating than typical 91-93 octane pump gas, but ethanol is roughly 30% less energy-dense than gasoline, so fuel consumption is higher. E85 works well for higher-boost and modern high-compression engines because the alcohol content helps cool the incoming air/fuel charge - cooler air is denser, which can support more power.
How can I mix fuel to calculate octane?
If your engine builder or tuning company recommends an octane rating that is not available locally, you may need to mix two fuels to reach the desired octane level. Use this formula:
(% Fuel A ÷ Desired Gal) × Octane Fuel A + (% Fuel B ÷ Desired Gal) × Octane Fuel B
What is the difference between fuel ratings?
In North America, octane is typically listed as the Anti-Knock Index, also shown as AKI, (RON+MON)/2, or (R+M)/2. In many other regions, octane is listed as RON, or Research Octane Number. MON stands for Motor Octane Number.
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