What is Flex Fuel?

Asked by Dec 15, 2017 at 02:36 PM

Question type: General

2 Answers

36,905

It's E85 fuel, a gasoline-ethanol blend of up to 85% ethanol. Vehicles designed to run on it will usually be badged as "FFV" (flex fuel vehicle) or "Flex fuel". It's cheaper gas, but the trade-off is worse gas mileage. AFAIK any E85 vehicle also runs most other types of gas as well, making E85 an option.

66,555

Ethanol blended gasolines are available from E-10 to E-85. 10 is 10% ethanol and 90% gasoline the 85 is 85% ethanol and 15% gasoline. For anything over E-15 to be properly used in a vehicle it should be a flex fuel vehicle. Those usually have a yellow gas cap or written indication that it is a flex fuel vehicle somewhere on it. As KenF stated E-85 is cheaper, but you will use more of it cause it has less energy content than plain old gasoline. E-85 does have a higher octane rating so a small boost in performance is possible using it in the correct type of vehicle. Do some reading at the link...https://www.fuelfreedom.org/what-are-flex-fuel-vehicles/

Your Answer:

Shortcuts

General Experts

  • #1
    Tom Demyan
    Reputation
    61,270
  • #2
    COMETGUY61
    Reputation
    42,970
  • #3
    F_O_R
    Reputation
    28,210
View All

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.