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Thread: Second FiST - 2016 Fiesta ST
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    So I found a chevron that sells e85 just 3miles from my house. I'm at just under 1/4 tank and need to refill soon. I am on an ots 91 stage 2 tune with cai and intercooler. How much e85 can I put in safely and top off with 91 and not screw anything up on my next refill?

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    Quote Originally Posted by cprytherch View Post
    So I found a chevron that sells e85 just 3miles from my house. I'm at just under 1/4 tank and need to refill soon. I am on an ots 91 stage 2 tune with cai and intercooler. How much e85 can I put in safely and top off with 91 and not screw anything up on my next refill?
    Is your 91 ethanol free, or 10% ethanol?
    2016 Kona Blue Fiesta ST- His
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    all i have in my tank is straight 91 from arco... i see talk about being able to put ethanol in on a stock tune... i dunno if i am able to do that on an ots stage 2 tune though... if i can it sounds fun and i just need to know what i am able to do hehe

    edit: after researching, i see that basically all 91 octane pump gas is not 10% ethanol. so i guess mine is 10% currently.

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    Quote Originally Posted by cprytherch View Post
    all i have in my tank is straight 91 from arco... i see talk about being able to put ethanol in on a stock tune... i dunno if i am able to do that on an ots stage 2 tune though... if i can it sounds fun and i just need to know what i am able to do hehe

    edit: after researching, i see that basically all 91 octane pump gas is not 10% ethanol. so i guess mine is 10% currently.
    I’m confused by this edit.

    If your 91 is 10%, you could probably put 1 gallon, or 1 1/2 gallons of E85 in without any issues.
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    all i have in my tank is straight 91 from arco... i see talk about being able to put ethanol in on a stock tune... i dunno if i am able to do that on an ots stage 2 tune though... if i can it sounds fun and i just need to know what i am able to do hehe

    edit: after researching, i see that basically all 91 octane pump gas is NOW 10% ethanol. so i guess mine is 10% currently.





    sorry about that. typo.

    okay and that would be fine with the ots stage 2 tune? just concerned but curious. not super familiar and learning as i go. a little ethanol just sounds like a ton of fun if it wont hurt anything

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    Quote Originally Posted by cprytherch View Post
    all i have in my tank is straight 91 from arco... i see talk about being able to put ethanol in on a stock tune... i dunno if i am able to do that on an ots stage 2 tune though... if i can it sounds fun and i just need to know what i am able to do hehe

    edit: after researching, i see that basically all 91 octane pump gas is NOW 10% ethanol. so i guess mine is 10% currently.





    sorry about that. typo.

    okay and that would be fine with the ots stage 2 tune? just concerned but curious. not super familiar and learning as i go. a little ethanol just sounds like a ton of fun if it wont hurt anything
    I don’t think you’d have any problem running a sub E20 mix on your OTS tune.

    I use this for mixing http://www.georgebelton.com/E85Calculator.php
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    thanks. so 1.5gal e85 would be a 19.1% or E19 mixture. its raining here now... and damnit going to be raining or a chance of rain here all the way until the weekend :/ oh well ill try it out on the next fill up hopefully. thank you for all the info!

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    Quote Originally Posted by cprytherch View Post
    thanks. so 1.5gal e85 would be a 19.1% or E19 mixture. its raining here now... and damnit going to be raining or a chance of rain here all the way until the weekend :/ oh well ill try it out on the next fill up hopefully. thank you for all the info!
    You bet. Hopefully you’ll be able to tell a difference.
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    I ran E30 on stock tune. And Cobb stage 3. Everything worked great. Now I'm on E30 with an E30 tune netting 26psi peak. The torque is pretty nice. I'm not sure how accurate the estimated HP and TQ readings are on the ap but there was a discernable and measurable difference on the ap and the butt Dyno. I have zero mods other than tune and AP.

 

 
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