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Know What's in Your Gas Tank

Ethanol is a renewable, domestically produced alcohol fuel made from plant material, such as corn, sugar cane, or grasses. Using ethanol can reduce oil dependence and greenhouse gas emissions. Ethanol fuel use in the U.S. has increased dramatically from about 1.7 billion gallons in 2001 to more than 13 billion in 2014.

E10 and E15

E10 and E15 are blends of ethanol and gasoline. The number after the "E" indicates the percentage of ethanol by volume. Most of the gasoline sold in the U.S. contains up to 10% ethanol. The amount varies by region and all auto manufacturers approve blends up to E10 in their gasoline vehicles. In 2011, EPA began allowing the use of E15 in model year 2001 and newer gasoline vehicles. Pumps dispensing E15 must be labeled. The vehicle owner's manual may indicate the manufacturer's maximum recommended ethanol content. Since ethanol contains about two-thirds as much energy as gasoline, vehicles will typically go 3% to 4% fewer miles per gallon on E10 and 4% to 5% fewer on E15 than on 100% gasoline.

E85 or Flex Fuel

E85, also called flex fuel, is an ethanol-gasoline blend containing 51% to 83% ethanol, depending on geography and season. Summer blends tend to have more ethanol while winter blends have less.


Due to ethanol's lower energy content, vehicles operating on E85 get roughly 15% to 30% fewer miles per gallon than when operating on regular gasoline, which typically contains about 10% ethanol.


The cost of E85 relative to gasoline or E10 can vary due to location and fluctuations in energy markets. Though typically cheaper per-gallon than gasoline, it is often slightly more expensive on a cost-per-mile basis.

Synthetic Oil in Johnson City

If you're looking for the best AMSOIL Synthetic Oil and lubricants, trust, AMSOIL. LLC in Jonesborough. We can help you find the right synthetic oil and lubricant for all your engines. Call us at (423) 845-0157 and check out our Online Shop for even more products. We proudly serve Johnson CityKingsportBristol and the whole Tri-Cities area.