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Ethanol fuels

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Old Apr 16, 2018 | 10:00 AM
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Default Ethanol fuels

Quick question. I recently moved to an area that has 3 ethanol blends at the pump. E15, E30, and E85. I am having a hard time know what the octane of the various grades are. I normally blend E85 with 91 octane. Does anyone know what octane fuel the oil companies use to blend with ethanol to get E15 or E30. I only use full E85 for at the track but E30 may be ok for daily use if the octane is high enough. Thanks in advance.
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Old Apr 16, 2018 | 10:26 AM
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Originally Posted by AZGASSER
Quick question. I recently moved to an area that has 3 ethanol blends at the pump. E15, E30, and E85. I am having a hard time know what the octane of the various grades are. I normally blend E85 with 91 octane. Does anyone know what octane fuel the oil companies use to blend with ethanol to get E15 or E30. I only use full E85 for at the track but E30 may be ok for daily use if the octane is high enough. Thanks in advance.
Not being a smart ***. I know you will get the best & CORRECT info from an internet search rather than a lot of folks posting incorrect or incomplete info. I just did a quick search & hundreds of sites (use verifiable sites-Wikipedia is good) explain it thoroughly & correctly unlike some posts here that may just be opinions.
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Old Apr 16, 2018 | 10:33 AM
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Thanks. No offense taken.
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Old Apr 16, 2018 | 10:42 AM
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Originally Posted by AZGASSER
Thanks. No offense taken.
I noticed on the one site I viewed it said the E15 for cars is a summer only blend that is only available June-Sept.-very interesting.
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Old Apr 16, 2018 | 01:07 PM
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I was ecstatic seeing E85 so close by. Not many places in AZ have it. They have 6 options at the pump, E15, E30, and E85 along 87, 89, and 91. Plus now at a lower altitude now the car pulls even harder. 2300 ft down to 800ft

Last edited by AZGASSER; Apr 16, 2018 at 01:08 PM.
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Old Apr 17, 2018 | 01:00 AM
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do you have any mods? your doing a e30/91 mix stock tune?

i thought the lt4 ran lean from the factory?
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Old Apr 17, 2018 | 01:12 AM
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I have the pullies done. Headers, meth and flex fuel in place. E85 is about 90cents a gallon cheaper than 91 so it’s a fair trade off for MPG. I think i will run mainly E30 for daily use. Never know when you need it.
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