Mercedes Mullins
Ethanol is a renewable fuel made from plant materials known as biomass. In the US, most finished motor gasoline contains about 10% ethanol by volume. This type of fuel is known as E10. However, there are other blends available, such as E15 (15% ethanol) and E85 (up to 85% ethanol). The higher the ethanol content in fuel, the more likely it is to clog up your carburetor and fuel lines. Unleaded 88, also known as E15, is a blend of ethanol and gas that is approved for use in all gasoline-powered vehicles.
| Characteristics | Values |
|---|---|
| Percentage of ethanol in unleaded fuel | Typically 10% (E10) but can be up to 15% (E15) or 85% (E85) |
| Other names for E15 | Unleaded 88, biofuel blend |
| Ethanol production | Made from various plant materials ("biomass") such as corn grain, sugar cane, or cellulosic feedstocks (e.g. wood chips, crop residues) |
| Benefits of ethanol | Renewable, reduces air pollution, improves engine health, supports American farmers and energy security, lower cost |
| Drawbacks of ethanol | More expensive, can clog carburetor and fuel lines, lower energy content than gasoline |
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What You'll Learn
- Ethanol is a renewable fuel made from biomass, such as corn grain or sugar cane
- Unleaded 88, or E15, is a blend of up to 15% ethanol and 85% gasoline
- E10 is a common blend of 10% ethanol and 90% gasoline
- E85 is a flex fuel that can contain up to 85% ethanol and is used in flex-fuel vehicles
- Using ethanol in small engines like lawnmowers can cause clogging and should be avoided
Ethanol is a renewable fuel made from biomass, such as corn grain or sugar cane
Ethanol (CH3CH2OH) is a renewable fuel made from plant materials known as biomass. It is also referred to as ethyl alcohol, grain alcohol, or EtOH. Ethanol is colourless and clear, and it has the same chemical formula regardless of its feedstock. The most common sources of ethanol are starch- or sugar-based feedstocks, such as corn grain, sugar cane, or cellulosic feedstocks like wood chips and crop residues.
In the United States, 94% of ethanol is produced from corn grain starch. This process has a positive energy balance, meaning that producing ethanol fuel requires less energy than the amount of energy contained in the fuel. Cellulosic ethanol, made from waste, coproducts, or dedicated crops, further reduces the amount of fossil fuel energy used in production. Additionally, cellulosic ethanol results in lower levels of life cycle greenhouse gas emissions.
Trees and grasses are alternative sources of ethanol that require less fuel, fertilizers, and water to grow than grains. They can also thrive on land unsuitable for food crops. However, despite these advantages, cellulosic ethanol production from trees and grasses is not economically viable for producers. As of the end of 2022, the United States had no commercial production of cellulosic ethanol.
Brazil, the world's second-largest consumer of fuel ethanol, primarily uses sugar cane to produce ethanol. Sugar cane-based ethanol qualifies as an advanced biofuel in the United States under the Renewable Fuel Standard Program (RFS). In the fermentation process, microorganisms like bacteria and yeast metabolize the sugar in sugar cane to produce ethanol. Denaturants are added to make fuel ethanol undrinkable.
The most common blend of ethanol in gasoline is E10, which contains 10% ethanol and 90% gasoline. E10 reduces air pollution and improves engine performance by preventing engine knocking and ensuring drivability. However, ethanol has lower energy content per gallon than gasoline, and higher ethanol content can clog carburetors and fuel lines, especially in small engines. Therefore, it is recommended to use non-ethanol fuel in equipment like mowers, blowers, and trimmers.
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Unleaded 88, or E15, is a blend of up to 15% ethanol and 85% gasoline
Unleaded fuel typically contains ethanol, a renewable fuel made from plant materials such as corn grain, sugar cane, or cellulosic feedstocks. In the United States, the majority of finished motor gasoline sold is E10, which contains 10% ethanol and 90% gasoline. This blend helps to reduce air pollution and meet the requirements of the Clean Air Act.
However, there is another type of unleaded fuel called Unleaded 88 or E15, which contains a higher percentage of ethanol. Specifically, Unleaded 88 is a blend of up to 15% ethanol and 85% gasoline. It is also referred to as a biofuel blend because of its higher ethanol content. This blend is approved for use in all gasoline-powered vehicles with a model year of 2001 or newer and offers several advantages.
One benefit of Unleaded 88 is its positive impact on engine health. The higher octane rating of 88, compared to 87 for regular unleaded, can reduce engine deposits and improve overall engine performance. Additionally, using Unleaded 88 can support American farmers and strengthen the country's energy security, as much of the ethanol in this blend is sourced from the United States, specifically Nebraska, a leading corn-growing state.
From a financial perspective, Unleaded 88 is a cost-effective option, typically priced 10 to 30 cents lower per gallon than regular unleaded gas. This makes it a smart choice for both your wallet and your vehicle. Furthermore, the production of corn-based ethanol for this blend results in valuable co-products, such as corn gluten meal and distillers' grains, which are nutritious and protein-rich ingredients used in livestock feed.
However, it is important to note that ethanol has a lower energy content than gasoline, and its impact on fuel economy depends on the volume percentage in the blend. Additionally, higher ethanol content can contribute to smog in hot weather, which has been a concern for summertime fuel sales. Nevertheless, waivers have been issued by the U.S. Environmental Protection Agency, allowing year-round sales of E15 in certain states, and assuring drivers that they can use this blend without negatively impacting air quality.
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E10 is a common blend of 10% ethanol and 90% gasoline
E10 is a blend of fuel that combines 10% ethanol with 90% gasoline. It is a common type of fuel, with most finished motor gasoline sold in the United States being E10. It is also known as Unleaded 88.
Ethanol is a renewable fuel made from plant materials, often corn grain in the United States. It has a higher octane number than gasoline, which can improve engine health and performance. Ethanol also has environmental benefits, as it is used to oxygenate the fuel, reducing air pollution.
E10 is one of several ethanol-gasoline blends, including E15 and E85. E15 is a blend of 15% ethanol and 85% gasoline, and E85 can contain up to 85% ethanol. E15 is also known as Unleaded 88, and is approved for use in all gasoline-powered vehicles. However, higher ethanol content can lead to a higher risk of clogging in carburetor and fuel lines, especially in small engines.
The use of ethanol in fuel has been encouraged by the US government, with the Clean Air Act and the Renewable Fuel Standard set forth in the Energy Independence and Security Act of 2007. The Renewable Fuel Standard Program is administered by the US Environmental Protection Agency (EPA).
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E85 is a flex fuel that can contain up to 85% ethanol and is used in flex-fuel vehicles
Unleaded fuel typically contains 10% ethanol, although this can vary. Ethanol is a renewable fuel made from plant materials, such as corn grain, sugar cane, or cellulosic feedstocks like wood chips.
E85, or flex fuel, is a blend of gasoline with a much higher ethanol content, containing between 51% and 85% ethanol. The exact percentage of ethanol in E85 depends on the season and the geographic region. For example, E85 sold in colder months may have lower levels of ethanol to aid with starting the engine in cold temperatures. E85 is designed for use in flex-fuel vehicles (FFVs), which have modified internal combustion engines that can run on traditional gasoline or blends of gasoline and ethanol. These vehicles can use either E85 or regular unleaded fuel.
Flex-fuel vehicles have sensors that detect the gasoline-ethanol ratio in the fuel and adjust for optimal performance. FFVs that use E85 have lower fuel economy ratings and travel fewer miles per gallon, despite the fuel costing less per gallon than regular gasoline. E85 is not available at all gas stations and is incompatible with traditional gas engines.
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Using ethanol in small engines like lawnmowers can cause clogging and should be avoided
Ethanol is a renewable fuel made from plant materials, and more than 98% of gasoline in the US contains ethanol. Typically, gasoline contains E10 (10% ethanol, 90% gasoline), which reduces air pollution. However, using ethanol in small engines like lawnmowers can cause several problems and should be avoided.
Firstly, ethanol has a higher affinity for water than gasoline. Once the ethanol in a fuel container reaches its saturation point, it can no longer absorb water, leading to phase separation. This results in the ethanol and water dropping to the bottom of the container, leaving the gasoline and oil floating on top. This can cause significant issues, such as a ruined carburetor and unstable engine operation.
Secondly, ethanol can dissolve plastic and create deposits in the carburetor, fuel injectors, fuel pumps, and other engine components. These deposits can lead to poor engine performance, loss of power, overheating, fuel-vapor lock, and premature deterioration of fuel lines and gaskets.
Additionally, as Marv Klowak, global vice president of research and development for Briggs & Stratton, states, "Ethanol has inherent properties that can cause corrosion of metal parts, including carburetors, degradation of plastic and rubber components, harder starting, and reduced engine life." The higher the ethanol content in the fuel, the more likely it is to cause these issues.
To avoid these problems, it is recommended to use non-oxygenated, ethanol-free gas in small engines, even though it may cost a little more. Alternatively, fuel additives such as AMSOIL Quickshot can be used to prevent phase separation and treat ethanol-related issues.
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Frequently asked questions
Unleaded fuel is a type of gasoline that does not contain lead. Unleaded fuel typically contains ethanol, which is a renewable fuel made from plant materials such as corn grain, sugar cane, or cellulosic feedstocks.
The amount of ethanol in unleaded fuel can vary, but it is typically around 10%. This type of fuel is often referred to as E10. However, there are also unleaded fuels with higher ethanol content, such as E15 (15% ethanol) and E85 (up to 85% ethanol).
Most of the ethanol used in unleaded fuel in the United States is produced from corn grain, with Nebraska being the second-largest producer.
