U.S. Energy Information Administration - EIA - Independent Statistics and Analysis
Frequently Asked Questions
How much ethanol is in gasoline and how does it affect fuel economy?
In 2013, about 135 billion gallons of motor gasoline (3.2 billion barrels) were consumed in the United States, which contained about 13 billion gallons of ethanol. Ethanol accounted for about 10% of the total volume of finished motor gasoline consumed.
Most of the gasoline now sold contains some ethanol, but the exact amount varies by region. In general, the ethanol content does not exceed 10% by volume. Gasoline with 10% ethanol content is referred to as E10 and with 15% ethanol as E15. E85 means there is 85% ethanol and 15% gasoline. Most of the gasoline with more than 10% ethanol is sold in the Midwest.
All gasoline vehicles can use E10. Currently only light-duty vehicles with a model year 2001 or greater can use E15. Only "flex-fuel" vehicles can use gasoline with an ethanol content greater than E15.
The energy content of ethanol is about 33% less than "pure" gasoline, although this varies depending on the amount of denaturant that is added to the ethanol. Thus, vehicle fuel economy may decrease by up to 3.3% when using E10.
Last updated: May 1, 2014
Other FAQs about Gasoline
- Can I tell where the gasoline at my local station comes from?
- Does EIA have energy consumption and price data for cities, counties, or by zip code?
- Does EIA have gasoline prices by city, county, or zip code?
- Does EIA have historical gasoline prices for each state?
- Does EIA have projections for energy production, consumption, and prices for individual states?
- Does EIA publish inflation-adjusted gasoline prices?
- How many gallons of diesel fuel and gasoline are made from one barrel of oil?
- How much carbon dioxide is produced by burning gasoline and diesel fuel?
- What was the highest U.S. average retail price of regular gasoline?
- What's up (and down) with gasoline prices?
- Why are the retail pump prices for gasoline and diesel fuel in increments of 0.9 cents?
- Why don't fuel prices change as quickly as crude oil prices?
- Why is the United States exporting gasoline when prices are so high?
- How much ethanol is in gasoline and how does it affect fuel economy?
- How much gasoline does the United States consume?
- How much tax do we pay on a gallon of gasoline and diesel fuel?
- What are the projections for U.S. gasoline and diesel fuel prices?
- What do I pay for in a gallon of gasoline and diesel fuel?