What Cars Run on E85 Fuel? How to Tell If Yours Is Flex Fuel

Only flex fuel vehicles (FFVs) can run on E85, and the list of cars that qualify has shrunk fast. In fueleconomy.gov’s listing of new E85-capable vehicles, model year 2012 shows 151 entries, while model years 2026 and 2027 together show 8, all from Buick, Chevrolet and GMC. This guide shows how to check whether your own car is an FFV (the checks are not equally reliable), which makers have built them, what E85 does to your mpg, and what to do if the wrong fuel goes in.

What Cars Run on E85 Fuel? Only Flex Fuel Vehicles

E85 is a gasoline-ethanol blend that EPA says can be used only in flex fuel vehicles, which are built to run on E85 or any blend from plain gasoline up to E85. The “85” is not fixed: AFDC and fueleconomy.gov both say E85 contains 51% to 83% ethanol depending on geography and season, with more ethanol in summer blends. A car built for gasoline only cannot use it, and being a certain model, trim or brand does not make a car an FFV. The engine, fuel system and software have to be built for it.

How to Tell If Your Car Is a Flex Fuel Vehicle

The fueleconomy.gov flex fuel guide notes that FFVs look like their gasoline-only twins, so you may be driving one without knowing it. These are the checks it and GM’s own bulletin describe, ranked by how far you can trust each one.

If the checks disagree or you find nothing, treat the car as gasoline-only. A yellow cap with no matching manual entry is a reason to call a dealer, not to pull the E85 handle. One more point that older guides get wrong: being a flex fuel model does not mean every version of it is. GM’s bulletin lists FFV status by engine code, so a 2010 Silverado or Sierra with the 4.8L (RPO L20) or 5.3L (RPO LC9 or LMG) is listed, while other engines in the same model are not.

Which Makers Build E85 Vehicles? The List Has Shrunk

AFDC says 20.9 million FFVs were on U.S. roads as of 2022 (Experian figure), and also notes that recent changes to Corporate Average Fuel Economy credits have reduced FFV availability. fueleconomy.gov’s new-vehicle search for E85 vehicles, which we read on October 12, 2026, shows that decline in numbers. The counts are listings (engine and drivetrain variants), not separate models, so treat them as a trend rather than an exact model count.

The maker lists above come from the model-year search results, and the sets for 2012, 2016 and 2019 may be incomplete if the search did not return every entry. For a specific car, use the manual, or run fueleconomy.gov’s own E85 search for your model year, and see our model guides for the Chevy Cruze and the Ford Fusion, two popular cars where the answer depends on the model year.

Which GM Engines Are Flex Fuel? An Example From GM’s Bulletin

GM’s service bulletin 05-06-04-035E (May 2015, hosted by NHTSA) is the most detailed maker list we found. It lists E85 versions such as the 2002 to 2005 full-size pickups and utilities with the 5.3L (RPO L59), the 2006 to 2011 Impala with the 3.5L (RPO LZE), 2011 to 2013 Equinox and Terrain variants, and the 2015 Silverado and Sierra with the 4.3L (RPO LV3) or 5.3L (RPO L83). The bulletin is written for technicians and says not to assume it applies to your vehicle, so use it to know what to ask a dealer, not as a final answer.

What Happens If You Put E85 in a Non-FFV?

GM’s bulletin says only FFVs designed for E85 should use E85, and that GM gasoline cars from model year 2011 and older are built for no more than 10% ethanol, with non-FFVs from model year 2012 on rated for up to 15% as the owner’s manual states. Putting E85 in a car that is not rated for it can cause:

• Lean running: hesitation, sag or stalling.
• A check engine light, with codes such as P0171 and P0174 (lean) or P0300 (misfire).
• Traction control, stability or ABS warnings, and harsh transmission shifts (the bulletin notes the transmission can default to maximum line pressure).
• Fuel system corrosion and engine mechanical wear.

For a shop, GM’s bulletin says to test the ethanol content of the tank, and if it is above the manual’s limit, drain the fuel and refill with gasoline. That is a job for a shop, not a driveway: fuel is flammable, and siphoning or draining a tank at home carries a fire risk. If you realize before leaving the pump, do not start the engine; if you already drove away, stop driving and call a shop or a tow. Warranty wording varies by maker and by claim, so read the warranty booklet. Our full guide to what happens if you put E85 in your car covers the aftermath in more detail. Diesel engines are not E85 compatible either, per the same bulletin.

Is E85 Worth It? The Break-Even Price

fueleconomy.gov says FFVs typically get about 15% to 27% fewer miles per gallon on E85. The 15% end is based on the energy content of a 51% ethanol blend; the 27% end comes from EPA tests of recent FFVs on ethanol-free gasoline versus E85. It also says E85 is typically cheaper per gallon but slightly more expensive per mile. So the question is how much cheaper the pump price has to be. Our arithmetic, from that range:

To use it, fill up once on each fuel, record the miles per gallon you actually get, and divide the E85 price by your E85 mpg. Compare that cost per mile with gasoline. Because the blend swings between 51% and 83% ethanol by season and region, your own number can move from fill-up to fill-up.

Where to Find E85: Station Counts

AFDC’s state table, updated October 12, 2026, lists 4,799 E85 stations in the U.S. Counts change as stations open and close, so use the AFDC Station Locator before a trip.

California leads the count, ahead of the corn-growing states, which is worth knowing if you assumed E85 is only a Midwest fuel. That is a count of stations, not of stations per driver, so it does not say how easy E85 is to find in a given city.

E85 Is Not the Same as E15 (Unleaded 88)

People often mix these up. E15 (unleaded 88) is a 15% ethanol blend that AFDC says is approved for 2001 and newer light-duty vehicles, and the pump label limits it to those cars and FFVs. E85 is a different fuel that only FFVs can use. If your car is not an FFV, E85 is off the table, but E15 may be allowed; see our guide to which cars can use unleaded 88.

Keep reading

• What Happens If You Put E85 in a Regular Car? Fixes & Risks
• Running E85 in a Carbureted Engine: A Beginner’s Guide
• What Happens If You Accidentally Put E85 in Your Car

Frequently Asked Questions

What cars use E85?

Only flex fuel vehicles. In fueleconomy.gov’s listing of new E85 vehicles, model years 2026 and 2027 include the Buick Encore GX and Envista, Chevrolet Trailblazer, Trax and Silverado, and GMC Sierra. Used FFVs come from many more makers; check the manual.

How do I know if my car is flex fuel?

Check the owner’s manual and the fuel door label first. A yellow gas cap, a yellow ring on a capless filler and an E85, Flex-Fuel or FFV badge are clues. fueleconomy.gov says most makers began yellow caps on FFVs in model year 2008 and GM in 2006. If in doubt, assume it is not an FFV.

Is there a full list of E85 compatible vehicles?

fueleconomy.gov has a search for E85 vehicles by model year. It is a good start, but it lists engine and drivetrain variants, so confirm your exact vehicle in the owner’s manual or with a dealer.

Can a regular car run on E85?

No. EPA says E85 can only be used in flex fuel vehicles. GM’s bulletin lists lean running, a check engine light, corrosion and engine wear among the problems in non-FFVs.

Does E85 hurt gas mileage?

Yes. fueleconomy.gov says FFVs typically get about 15% to 27% fewer miles per gallon on E85, because ethanol holds less energy per gallon than gasoline.

Can a diesel truck run on E85?

No. GM’s bulletin says diesel engines are not E85 compatible.

The Short Version

Check the manual and fuel door first, treat a yellow cap or badge as a clue rather than proof, and when in doubt use regular gasoline. Sources: fueleconomy.gov, AFDC, EPA, and GM service bulletin 05-06-04-035E (NHTSA-hosted). Vehicle details vary by model year and engine. For a specific car, the owner’s manual or a dealer has the final say.