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Thread: E15 and MPG?

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    E15 and MPG?

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    There was some conflicting data on E15 and the Fiesta ST, however, seems like people can run it on the newer models just fine!
    What year model started supporting E15?

    And how does it affect MPG (same riding conditions)?
    I would estimate that E15 works better on turbo cars running hot climates, than any other..

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    Member 163 Rep Points zanethan's Avatar
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    E15 and MPG?

    As I understand it, you can run up to E50 on the stock fuel system. That being said you won't see any performance benefit without a tune that takes advantage of ethanol content. The higher the ethanol content the worse your MPG will be. I think E30 tuned fiestas generally return high 20s to 30 MPG on the highway.

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    Senior Member 618 Rep Points TyphoonFiST's Avatar
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    Quote Originally Posted by zanethan View Post
    As I understand it, you can run up to E50 on the stock fuel system. That being said you won't see any performance benefit without a tune that takes advantage of ethanol content. The higher the ethanol content the worse your MPG will be. I think E30 tuned fiestas generally return high 20s to 30 MPG.
    I'd say mid 20s to high 20s for fuel economy with blending!

    Sent from my SM-N950U1 using Tapatalk
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    Ethanol simply has less energy, and your miles per gallon will suffer. They sell E15 where I live it's only 88 octane, I hope you wouldn't use that.

    Sent from my LG-LS997 using Tapatalk

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    Quote Originally Posted by Ford ST View Post
    Ethanol simply has less energy, and your miles per gallon will suffer. They sell E15 where I live it's only 88 octane, I hope you wouldn't use that.

    Sent from my LG-LS997 using Tapatalk
    The right way is to have a tune for e85 and 91 or 93 and blend them. Silly guy...anyone else who thinks otherwise is a dumby!

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    Well, from an economic point of view, does it make sense switching for a regular driver?
    I get E15 for $2.29/gal over here, while regular costs like $2.69-2.77/gal. That's like a saving of 2 gal per tank.

    I thought the fuel cap read no E20-E80, but I could be wrong. I guess it might be OK for a short time, but the fuel is said to deteriorate the fuel lines.

    Some mentions have been made that E15 lubricates the top part of the cylinder more, causing the engine to run cooler and smoother?
    My butt dyno does feel a slightly higher performance on E15, but it might be placebo.

    Ethanol has an octane rating of 113, so i suspect E15 is mixed with 87 octane fuel, giving about a 89 octane rating.

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    You can run E15 safely, you just have to figure out is it worth the MPG loss. Where I live E15 is $0.10 a gallon cheaper than 87. I run 93 which is $0.60 more than 87 on average.

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