How much ethanol is in gasoline, and how does it affect fuel economy?The U.S. Energy Information Administration (EIA) estimates that in 2021, the 134.83 billion gallons of finished motor gasoline consumed in the United States contained about 13.94 billion gallons of fuel ethanol, equal to about 10% of the total volume of finished motor gasoline consumption. Fuel ethanol contains a denaturant that is added to ethanol to make fuel ethanol unfit for human consumption. Federal law requires that fuel ethanol contain at least 2% denaturant by volume, but the actual amount in fuel ethanol may be higher. Show Most of the gasoline now sold in the United States contains some ethanol. Most of ethanol blending into U.S. motor gasoline occurs to meet the requirements of the 1990 Clean Air Act (RFG Fuel) and the Renewable Fuel Standard set forth in the Energy Independence and Security Act of 2007. The U.S. Environmental Protection Agency (EPA) administers the requirements with the Renewable Fuel Standard Program. There are three general categories of ethanol-gasoline blends: E10, E15, and E85. E10 is gasoline with 10% ethanol content. E15 is gasoline with 15% ethanol content, and E85 is a fuel that may contain up to 85% fuel ethanol. The ethanol content of most of the motor gasoline sold in the United States does not exceed 10% by volume. Most motor gasoline with more than 10% fuel ethanol content is sold in the Midwest where most ethanol production capacity is located. Gasoline dispensing pumps generally indicate the fuel ethanol content of the gasoline. All gasoline engine vehicles can use E10. Currently, only flex-fuel and light-duty vehicles with a model year of 2001 or newer are approved by the EPA to use E15. Flex-fuel vehicles can use any ethanol-gasoline blends up to E85. The energy content of ethanol is about 33% less than pure gasoline. The impact of fuel ethanol on vehicle fuel economy varies depending on the amount of denaturant that is added to the ethanol. The energy content of denaturant is about equal to the energy content of pure gasoline. In general, vehicle fuel economy may decrease by about 3% when using E10 relative to gasoline that does not contain fuel ethanol. Learn more: Last updated: May 10, 2022 Other FAQs about Gasoline
 Ethanol is a renewable fuel made from various plant materials collectively known as "biomass." More than 98% of U.S. gasoline contains ethanol, typically E10 (10% ethanol, 90% gasoline), to oxygenate the fuel, which reduces air pollution. Ethanol is also available as E85 (or flex fuel), which can be used in flexible fuel vehicles, designed to operate on any blend of gasoline and ethanol up to 83%. Another blend, E15, is approved for use in model year 2001 and newer light-duty vehicles. There are several steps involved in making ethanol available as a vehicle fuel:
Fuel PropertiesEthanol (CH3CH2OH) is a clear, colorless liquid. It is also known as ethyl alcohol, grain alcohol, and EtOH (see Fuel Properties search.) Ethanol has the same chemical formula regardless of whether it is produced from starch- or sugar-based feedstocks, such as corn grain (as it primarily is in the United States), sugar cane (as it primarily is in Brazil), or from cellulosic feedstocks (such as wood chips or crop residues). Ethanol has a higher octane number than gasoline, providing premium blending properties. Minimum octane number requirements for gasoline prevent engine knocking and ensure drivability. Lower-octane gasoline is blended with 10% ethanol to attain the standard 87 octane. Ethanol contains less energy per gallon than gasoline, to varying degrees, depending on the volume percentage of ethanol in the blend. Denatured ethanol (98% ethanol) contains about 30% less energy than gasoline per gallon. Ethanol’s impact on fuel economy is dependent on the ethanol content in the fuel and whether an engine is optimized to run on gasoline or ethanol. Ethanol Energy BalanceIn the United States, 94% of ethanol is produced from the starch in corn grain. Energy is required to turn any raw feedstock into ethanol. Ethanol produced from corn demonstrates a positive energy balance, meaning that the process of producing ethanol fuel does not require more energy than the amount of energy contained in the fuel itself. Cellulosic ethanol improves the energy balance of ethanol because the feedstocks are either waste, co-products of another industry (wood, crop residues), or are dedicated crops—such as switchgrass and miscanthus—with low water and fertilizer requirements compared to corn. When biomass is used to power the process of converting non-food-based feedstocks into cellulosic ethanol, the amount of fossil fuel energy used in production is reduced even further. Another benefit of cellulosic ethanol is that it results in lower levels of life cycle greenhouse gas emissions. For more information on the energy balance of ethanol, download the following documents:
Does premium gas have ethanol in it?Premium gas doesn't provide any more power or contain better additives than regular gas, and it contains the same amount of ethanol as other grades. It just resists detonation (knock) better than lower-octane gas—nothing more, nothing less.
How much ethanol is in 93 octane gasoline?I depends on the state, but I have found after testing more than 100 gas stations around New England that ultra and premium at various stations 91 & 93 octane, have a range of 5–10% ethanol mixed into them. I know this because I did a chemical analysis of the gasoline and came up with these numbers.
What gas has the least amount of ethanol?REC-90 is an ethanol-free, 90 octane unleaded gasoline blend designed for use in recreational/marine engines which can be damaged by the ethanol found in other gasoline blends.
Is there ethanol in 91 octane fuel?According to Dan McTeague, a noted petroleum analyst, Shell and Esso 91 are both ethanol free. [UPDATE: Chevron notes on its website that in some locations in Canada, its Supreme Plus 94 Octane fuel is also ethanol-free, as of 2022.
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How much ethanol in premium gas
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