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Ethanol free gas ?

Discussion in 'The Okie Corral' started by meathead19, May 1, 2013.

  1. meathead19

    meathead19

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    So, I see this big sign at the gas station stating E free gas gives you 25% more gas milage.

    Is there any truth to this?

    It was 3.39/gal so it's about .20 more than other local gas stations, but they're not E free.

    I've also heard that the E gas can play havoc on your catalytic converter....true?

    Thanks.
     
  2. Bushflyr

    Bushflyr ʇno uıƃuɐɥ ʇsnɾ Millennium Member

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    No. And No.

    Ethanol has a lower energy density than gasoline, so, naturally, you get slightly worse mileage with it, but nowhere near 25% unless you're using E85. And even then it's a stretch.

    And E does nothing to your cats. On older engines it can eat some of the seals, but it's not an issue in any auto less than about 20 years old.
     

  3. czsmithGT

    czsmithGT

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    Based on energy per gallon, E85 would result in reduced mileage of 17-27% versus 100% gasoline. E10 would reduce mileage by about 3-4%.
     
  4. BigDeeeeeeee

    BigDeeeeeeee Reluctantly Deplorable!

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    Definitely more power, more mileage but not 25%. I burn Premium non E in my Toyota. Edit to add: if your comparing E85 vs gas then it is probably 25%, I was thinking about the 10% E blend sold around here.

    From Wiki for the engine in my FJ Cruiser: "An updated version of this engine features Dual VVT-i, increasing output to 254 hp (189 kW) and 270 lb·ft (366 N·m) on 87 octane and 285 hp (213 kW) and 289 lb·ft (392 N·m) on 91 octane."

    http://en.wikipedia.org/wiki/Toyota_GR_engine#1GR-FE

    Now that just shows the difference between grades of gasoline but given that it takes around 1 and a half times as much alcohol as gas to produce a given amount of power even a 10% blend gives a noticeable reduction in power and mileage, not to mention longevity. YMMV:supergrin:
     
    Last edited: May 1, 2013
  5. meathead19

    meathead19

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    So, you say one does get improved mileage w E free gas??
     
  6. Bushflyr

    Bushflyr ʇno uıƃuɐɥ ʇsnɾ Millennium Member

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    Do you understand energy density? :upeyes:
     
  7. Kablam

    Kablam

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    A little bit, yeah.
     
  8. Slug71

    Slug71

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    Yes..

    Valero stations sell E free gas.
     
    Last edited: May 1, 2013
  9. meathead19

    meathead19

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    I'll do some research.
     
  10. BigDeeeeeeee

    BigDeeeeeeee Reluctantly Deplorable!

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  11. Slug71

    Slug71

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    E free gas is also good for small engines(lawn mower, snow blower etc..).
     
  12. jilverthor

    jilverthor

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    Yes, but it isn't the 25% difference that was posted.
     
  13. GIockGuy24

    GIockGuy24 Bring M&M's

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    The 10 percent is a maximum. It usually has somewhat less and if it wasn't alcohol it would be another additive anyway.
     
    Last edited: May 1, 2013
  14. meathead19

    meathead19

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    A long time mechanic that specializes in exhaust systems says he's never seen so many problems with catalytic converters and he blames E gas.
     
  15. Bushflyr

    Bushflyr ʇno uıƃuɐɥ ʇsnɾ Millennium Member

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    Go read THIS THREAD. Old thread, but everything you ever wanted to know about E in fuel.
     
  16. Bushflyr

    Bushflyr ʇno uıƃuɐɥ ʇsnɾ Millennium Member

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    Ummm, no. You can make WAY more power on ethanol than you can on straight gas.
     
    Last edited: May 1, 2013
  17. BigDeeeeeeee

    BigDeeeeeeee Reluctantly Deplorable!

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    Not on the same volume.

    One US gallon of gasoline contains 114,000 BTU of energy; ethanol only has 76,100 BTU's of energy per gallon.
     
  18. jilverthor

    jilverthor

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    In an engine that is designed for it. Straight ethanol will let you run much higher compression ratios. You still don't get better mileage, but you can produce a bunch of power this way (See NHRA)
     
  19. Adjuster

    Adjuster

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    It is a necessity for boats. E gas will tear a boat fuel system to pieces if the right very common conditions are met.


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