What is 10 percent ethanol?
Also, many flex fuel vehicles can run on E85, an alternative fuel that is 85 percent ethanol and only 15 percent unleaded gasoline. However, the vast majority of the nearly 13 billion gallons of ethanol used annually in the U.S. is E10, the 10 percent ethanol blend.
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.
- 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.
- The United States became the world's largest producer of ethanol fuel in 2005. The U.S. produced 13.9 billion U.S. liquid gallons (52.6 billion liters) of ethanol fuel in 2011, an increase from 13.2 billion U.S. liquid gallons (49.2 billion liters) in 2010, and up from 1.63 billion gallons in 2000.
- Ethanol gasoline fuel is commonly called E10, E85, corn fuel, alcohol fuel and reformulated, renewable fuel and gas. 10% ethanol gasoline can dissolve 50 times more water than conventional non-alcohol gasoline. E10 gasoline contains 10% ethanol alcohol and E85 contains 85% ethanol alcohol.
Pure gas gives better mileage than E10, and much better than E85, simply because gasoline has higher free energy than ethanol. The free energy of gasoline is 34.2 MJ per liter. Mileage will be reduced even more if your engine doesn't run as well on E10, which is often the case with older vehicles.
- For the most part, ethanol doesn't affect you very much. Yes, you might get a little bit better mileage and performance with pure gasoline, but not enough to offset the cost of buying non-ethanol gas if it's available in your region. According to the U.S. government, all gasoline-powered vehicles can use E10 safely.
- Almost all gasoline now has some ethanol in it. Our Exxon and Mobil branded gasoline currently contains up to 10%. Gasoline with 10% ethanol content is known as E10, and with 15% ethanol it's known as E15. Ethanol flex fuel (formerly known as E85) has between 51 and 83% ethanol with the remainder being gasoline.
- The Environmental Protection Agency has approved gasoline with 15 percent ethanol for use in cars year 2001 or newer, yet it prohibits its use in mowers and other power equipment, stating it may cause damage. But even gas with the usual 10 percent ethanol (E10) could help destroy small engines.
Updated: 2nd October 2019