SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cars-e85-flex-fuel-only

The pump says E85. Which vehicles are built to run on it?

Only flex-fuel vehicles (FFVs), built for blends up to 83% ethanol.

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  1. Only flex-fuel vehicles ✔
  2. Any gas car made after 2001
  3. Only diesel trucks

Why: E85 holds 51% to 83% ethanol. Flex-fuel vehicles have an ethanol-compatible fuel system and engine tuning made for it. Ordinary gas cars are not built for that much ethanol.

Huh, didn't know that: E85 usually gives fewer miles per gallon than gasoline, because ethanol holds less energy.

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References

Answer: Only flex-fuel vehicles. E85 holds 51% to 83% ethanol. Flex-fuel vehicles have an ethanol-compatible fuel system and engine tuning made for it. Ordinary gas cars are not built for that much ethanol.

  1. Flexible Fuel Vehicles (Alternative Fuels Data Center, US DOE) afdc.energy.gov/vehicles/flexible-fuel
    capable of operating on gasoline and any blend of gasoline and ethanol up to 83%
    Checked 2026-10-11.
  2. E85 (Flex Fuel) (Alternative Fuels Data Center, US DOE) afdc.energy.gov/fuels/ethanol-e85
    high-level ethanol-gasoline blends containing 51% to 83% ethanol
    Checked 2026-10-11.

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