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E85 Guide: Everything You Need to Know About Flex Fuel

E85 Guide: Everything You Need to Know About Flex Fuel

A gasoline pump that dispenses E85 Flex Fuel.

Autos that can run on flexible gasoline, a blend of gasoline and ethanol also acknowledged as “flex gas,” started off getting to be preferred in the 1990s. In flip, manufacturers started generating new autos that could use this biofuel mix. But several motorists do not know much about ethanol-blended gasoline labeled E85 at gasoline pumps.

Even some owners of flex-gasoline vehicles, or FFVs, have inquiries about gasoline-ethanol blends. Study on to master about flex gasoline and no matter if you can use E85 or other blended gas in your auto.

What is Flex Gasoline?

Adaptable gasoline is the typical time period for a renewable and domestically produced alternate gasoline that is gasoline blended with ethanol. Ethanol gets produced from a selection of plant products, including corn. Most of the gasoline offered in the United States has some ethanol. But E85 for FFVs takes advantage of a greater proportion of ethanol.

E85 is a gasoline-ethanol blend that contains amongst 51% to 85% ethanol, relying on the time and geographic location of the distributor. For instance, E85 sold all through colder months frequently has reduce amounts of ethanol to deliver the vapor pressure necessary for beginning in cold temperatures.

Related: Types of Gasoline Spelled out: Find out the Dissimilarities

Can My Automobile Use Flex Fuel?

Manufacturers make flex-gas autos with modified inner combustion engines working with classic gasoline and ethanol blends, these types of as E85. A badge with “Flex-Gasoline,” “FFV,” or “E85” on the rear of the motor vehicle could reveal it is compatible with the option gas.

Possessing a yellow gasoline cap is a fantastic indication that the vehicle can use flex gasoline. If the automobile has a capless gasoline filler, a yellow ring about the hole where the nozzle will get inserted indicators E85 functions for the motor vehicle.

Making use of any octane level of gasoline in a flex-gasoline motor vehicle is appropriate. The sensors in an FFV detect no matter whether the gas is pure gasoline or 85% ethanol and make vital variations for optimal fuel injection and timing of combustion.

Putting E85 in a automobile not designed for flexible gasoline can be dangerous. Usually refer to the owner’s handbook for specifications on gas to use in your auto.

Why Would I Use Flex Fuel?

Proponents of larger ethanol-gasoline blends cite decreased greenhouse gasoline emissions considering that flex fuel burns cleaner than pure gasoline, and its use lessens reliance on foreign oil. The primary ingredient in processing ethanol is corn, a sustainable crop developed in the U.S.

E85 has a lessen charge for each gallon than regular gasoline, generating it an eye-catching solution. At this time, the AAA countrywide ordinary gasoline rate for a gallon of E85 is $4.34 — 68 cents fewer than a gallon of standard unleaded fuel.

Flex Gas Negatives

Whilst the cost for each gallon of E85 is ordinarily less than common gasoline, FFVs making use of the ethanol-gasoline mix have lower gasoline financial system rankings. In some scenarios, the variation in mileage is near to 25%.

For illustration, a 2022 Ford F150 Pickup 2WD FFV with a 3.3-liter 6-cylinder motor earns 21 put together mpg when using gasoline but only 16 combined mpg when applying E85. Generally, the lessen cost for each gallon for E85 offsets the mileage decline.

Availability of E85 and FFVs

Additional than 4,200 fuel stations throughout the U.S. promote E85 flex fuel, largely in corn-developing eastern and mid-western states. You can discover automobiles suitable with E85 nationwide because people automobiles can also use traditional gasoline.

It is unclear how a lot of flex-gasoline motor vehicles exist on the street today. According to the exploration and information business IHS Markit, there had been at minimum 21 million FFVs in the U.S. in 2017.

The range of new FFV offerings from companies has lowered. The cause: Federal incentives for automakers shifted to individuals making electric motor vehicles.

Only two automakers — Ford and Standard Motors — supply FFVs in the design calendar year 2022. Just 11 2022 styles will be readily available as FFVs, with the four GM choices bought only to fleet purchasers. In accordance to the Renewable Fuels Association, which is down from more than 80 distinctive models from 8 manufacturers, readily available to customers as not too long ago as the design calendar year 2015.

Related: How Do Electric Automobile Tax Credits Work?

Other Ethanol Blends


About 98% of the gasoline marketed in the U.S. is made up of ethanol, ordinarily E10 with 10% ethanol and 90% gasoline.


The EPA has authorised a further mix, E15, in all light-weight-responsibility cars because the design yr 2001. Producers dependable for almost 95% of U.S. light-weight-obligation auto revenue endorse the use of E15 in their model yr 2022 cars, in accordance to a review of owner’s manuals by the trade team RFA.


The RFA’s once-a-year review suggests that E25 blends, that contains up to 25% ethanol, are authorised by the maker for use in BMW and Mini autos.


E98, 98% ethanol, is a well-liked gasoline for some types of race autos.

If you are hoping to obtain the appropriate vehicle for you, look at out our very best autos and top 10 lists.

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Editor’s Take note: This report has been up-to-date for accuracy given that it was at first posted.