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Discussion Starter · #1 ·
Ok, so I know there will be a few opinions on this, but I'm curious about gas choice and more specifically with or without ethanol. I have a 2017 3500 with a 6.4L, less than 2000 miles on it still.

The owner's manual states 89 octane for optimal performance and efficiency. I've always put 89 octane with 10% ethanol in my previous Hemi truck.

This morning I was filling up at the same station I always use and the pump I was at had a choice of Non-ethanol gas 89 octane. The manual doesn't state anything about using Non-ethanol, just that up to 15% ethanol is safe. However, the Non-ethanol 89 octane gas was $2.999 per gallon and the 89 octane 10% ethanol was $3.019 per gallon. Made me wonder if I could use the Non-ethanol without risk.

I typically only put Non-ethanol in marine engines because I know the ethanol can destroy those much faster.

So, thoughts on the 6.4L Hemi and ethanol?
 

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I thought you might find the thread linked below informative. There's even a poll! For me personally, and I don't have the 6.4 Hemi, just the 5.7, I run 87 w/ 10% ethonal, but from top-tier gas stations such as Shell only.

https://www.ramforumz.com/showthread.php?t=251497
 

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Discussion Starter · #3 ·
That was a good thread with a poll, but didn't really answer the question. Is there any risk to switching back and forth between non-ethanol and ethanol based gas?
 

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I run the ethanol 10% in my 65 ford Falcon but when I can I use the non ethanol without any problems. I do not see any reason not to use the non ethanol when it is cheaper than ethanol as long as it is 89 octan or better. I have used the 87 when the 89 isn't available but I do get a slight better milage when using the 89 or higher even when using the ethanol especially when pulling a trailer. Hope this answers your question.
Carol
 

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If 89 w/o ethanol is cheaper than always use that. I wish I had access to 89 without ethanol for that price.
 

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'18 RAM 3500 4WD Tradesman 6.4
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89 octane is not the mid grade here in Colorado, it's super and it's expensive, ethanol or not.
85 octane is regular and 87 is mid grade.
I've been running 87 in our 6.4, which the manual says is fine so long as there are no symptoms of excessive knocking. I've detected no symptoms of any knocking at all and on those few occasions when I have run a tank of 89 octane I've noticed no difference either in mileage or performance.


I have seen comments on this forum and elsewhere from Hemi owners who run the 85 octane here and they report no problems either, though the manual cautions about that being problematic and might possibly engender a warranty issue under certain circumstances.



As for the ethanol content, the manual says "up to 15% ethanol" is fine, which I take to mean that any ethanol content from 0% to 15% is perfectly suitable.
So long as the fuel I'm pumping lies within that range, I don't give it a thought.
 

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Ok, so I know there will be a few opinions on this, but I'm curious about gas choice and more specifically with or without ethanol. I have a 2017 3500 with a 6.4L, less than 2000 miles on it still.

The owner's manual states 89 octane for optimal performance and efficiency. I've always put 89 octane with 10% ethanol in my previous Hemi truck.

This morning I was filling up at the same station I always use and the pump I was at had a choice of Non-ethanol gas 89 octane. The manual doesn't state anything about using Non-ethanol, just that up to 15% ethanol is safe. However, the Non-ethanol 89 octane gas was $2.999 per gallon and the 89 octane 10% ethanol was $3.019 per gallon. Made me wonder if I could use the Non-ethanol without risk.

I typically only put Non-ethanol in marine engines because I know the ethanol can destroy those much faster.

So, thoughts on the 6.4L Hemi and ethanol?
You are very lucky, ethanol free gas is about $1 per gallon more here.

If an engine is designed to use ethanol then it will not hurt the engine. Around water, like a boat, since ethanol is water soluble well...

Pure gas will have more energy than an ethanol mix so using the pure gas would be better. As far as mixing the two, or switching between the two, it doesn't matter.

When the manual says up to 15% ethanol, read that as 0% to 15% ethanol, 0% being pure gasoline.
 

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Discussion Starter · #8 ·
Pure gas will have more energy than an ethanol mix so using the pure gas would be better. As far as mixing the two, or switching between the two, it doesn't matter.

When the manual says up to 15% ethanol, read that as 0% to 15% ethanol, 0% being pure gasoline.
Thanks! That helps and I'll go that route next time I'm there.
 

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My 2012 Journey would burn E85 but the E85 had to be 25% cheaper to makeup for the mpg drop.
 

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When I lived in NC there was a station near me that sold ethanol free 89 octane, I would get about 2 MPG better with it, maybe a little less. The main reason I ran it was for the health of my fuel system.


I haven't found a place that sells ethanol free 89 here (I haven't really looked), so I've just been making sure to run top tier 89 (usually Mobil or Phillips 66). Gulf sells ethanol free 91, but I'm not running 91 octane in my truck
 

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I mainly use 87 octane non ethanol I get from a Native American Casino gas station near where I live and it is about 70 cents a gallon less than the 87 octane Chevron gas in this area. I don't know what cleaning agents are in the non ethanol if any, so every fourth tank I fill up with Chevron with Techron to keep my credit card active. I have noticed I get better MPG with the non ethanol.
 

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I mainly use 87 octane non ethanol I get from a Native American Casino gas station near where I live and it is about 70 cents a gallon less than the 87 octane Chevron gas in this area. I don't know what cleaning agents are in the non ethanol if any, so every fourth tank I fill up with Chevron with Techron to keep my credit card active. I have noticed I get better MPG with the non ethanol.
In the interests of low emissions, gasoline is required to have certain additives to keep the engine clean, regardless of the station's brand name.

Since gasoline is refined and piped to terminals where additives are added before retail delivery, I doubt there is little difference between the brands outside of additional additives which may or may not benefit your vehicle. Now it is a game of marketing and not product quality.
 
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