This blog will discuss how much ethanol is found in gasoline of different octane ratings. Let’s begin with a quick response:

The United States has gasoline with an octane ratings between 87 and 93 that contains 10 or 15% of ethanol. These gasolines are known as E-10 or E-15. E-85, on the other hand has an octane rating that is 94 or higher.

But that doesn’t solve the whole question. We’ll explain the ethanol content of each gasoline type in greater detail below. We will also explain why these percentages were chosen and how they have increased. We’ll also be discussing how much ethanol E-85 contains and the differences between E10 and E15. We’ll also discuss which gasoline type is best for your vehicle. Continue reading!

What is the Ethanol Content in each type of gasoline?

We mentioned in our introduction that gasoline with an octane rating 87,88,89, 90, 91, 91, or 93 has a ethanol percentage of either 10 or 15. Why is the gasoline sold with a lower or higher ethanol percentage? And why did we settle on these numbers?

Regular gasoline is cleaner than regular gasoline

Because it is cleaner than gasoline made entirely from gasoline, ethanol is often mixed with gasoline. In 1990, Congress mandated the use ethanol in gasoline. In 2005, Congress passed the Renewable Fuel Standard. This required that gasoline contain a minimum amount of ethanol.

Contrary to popular belief, there is no scientific evidence that ethanol burns cleaner than regular gasoline. However, scientific studies have not been conclusive. We know that ethanol is easier to make (from plants like sugarcane and corn). Furthermore, ethanol can be made from plants that absorb CO2 during growth, making it 40% cleaner than regular gasoline over its entire lifecycle.

Politically motivated

E-10 and E-15 are both still in use today because they create many jobs. Iowa, for example, can track $5 billion annually and 47,000 jobs back directly to gasoline ethanol production. Because Iowa is such a crucial state, politicians have made it a point to support ethanol in gasoline.

Regulations changing

E-10 and E-15 are both a result of politics. Ethanol was initially introduced into gasoline in 1990 with 10%.

The Renewable Energy Standard, which they had signed in 2005, was raised by Congress in 2007. They aimed to sell 36 million gallons of Ethanol by 2022. Carmakers were then forced to create cars that could run on 15% ethanol, instead of 10% as before.

If you look at the owners manuals for different models of the same car, owners manuals written after 2012 will state that the car can be used for 15% ethanol.

Can 87-93 Octane also be E-85?

E-85 gasoline is another thing we haven’t mentioned. This gasoline has a higher ethanol content than regular E-10 and E-15, as the name implies. It doesn’t contain 85% in the United States.

E-85 is generally 85% ethanol in other regions of the globe. E-85 must be adjusted for seasonal variations in North America (or else cars won’t start) because it is difficult to ignite at low temperatures.

E85 sold in the United States contains 51 to 83% ethanol depending on where it is produced and when it is used. This could also be a 87-93 octane gasoline.

It is unlikely that E-85 will have an octane rating below 93. Ethanol has an octane ranking of 100-113. The ethanol we use has a 100 octane rating.

The gasoline manufacturers must then mix it with regular gasoline or premium gasoline, with an octane rating of 87-95. Our ethanol contains 49% regular gasoline at an octane 87 and 51% ethanol at an octane 100.

Fuel with an octane of 93,63 = 49% x 87 + 51% x 100 E-85 cannot have an octane rating lower than 93.

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