What Is E85?

E85 is a high-ethanol fuel for flex-fuel vehicles. The exact ethanol content changes by season and region, so the name does not mean every gallon is exactly 85 percent ethanol.

Only use it in an approved vehicle

Flex-fuel vehicles are designed with fuel-system materials and engine controls that can handle high-ethanol blends. Conventional gasoline vehicles should not use E85 unless specifically approved.

Look for flex-fuel identification

A yellow fuel cap, fuel-door label, owner's manual, or vehicle information can identify flex-fuel capability. Do not rely on appearance alone.

Fuel economy can be lower

Ethanol has less energy per gallon than gasoline, so E85 usually delivers fewer miles per gallon even when the price per gallon is lower.

Compare cost per mile

If your vehicle is flex-fuel capable, compare local price, expected fuel economy, availability, and driving range rather than judging only by pump price.

Quick checklist

Use the product label, manufacturer directions, and the specific requirements of your situation. Compare the complete product or system rather than making a decision from one marketing phrase, ingredient, or number.