Can the hemi run on e15?

[ekaz]

Huh. Seems pretty common around here. But I don’t use it.

I turned on the news for the weather and caught some of the other dribble about this and they said its only at approx. 2300 stations. I mean, it is possible they are wrong.

 

[HEMIJAKE]

I ran e30 in my mustang before I traded it (tuned of course). Lovely stuff, makes great power. The more ethanol, the less energy. So it does take more fuel to achieve the same impact. So it could result in lower mpg, but that would be up to you to determine after a couple tanks. Not sure how big of an impact there would be going from 10 to 15. In my case, 10 to 30, lowered my mpg's from about 29 to 24-25. With the increase in power (again tuned), I didn't care, and it was cheaper.

 

[HEMIJAKE]

I turned on the news for the weather and caught some of the other dribble about this and they said its only at approx. 2300 stations. I mean, it is possible they are wrong.

Maybe they meant full e85 not e15. There is only 1 place in my county with e85, luckily next door to work. Otherwise, I never would have tuned my mustang for e30 (mix of e85 and 93 pump gas).

 

[ferraiolo1]

It’s correct. It’s in the news now how the administration is trying to push more fuel stations to sell it since it’s cheaper.

Good reading here

Biden’s approval of E15 gas will only affect 1.5% of gas stations

Also never knew it was banned for summer use lol


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[HEMIJAKE]

It’s correct. It’s in the news now how the administration is trying to push more fuel stations to sell it since it’s cheaper.

Good reading here

Biden’s approval of E15 gas will only affect 1.5% of gas stations

Also never knew it was banned for summer use lol


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That number truly surprises me. I figured a ton more places carried it. I never saw it banned in the summer either haha.

 

[mikeru82]

E15 is very hard to find where I live. In fact, I can't say I've even ever seen a pump with it. In reality I probably have and just didn't notice it. But even if it were available I would only use it if it's significantly cheaper than e10. Otherwise what's the point?

 

[Ninety-9 SE-L]

no mpg doesn’t suffer, I’ve been running it for a while now in my truck and other car. And my truck sits for weeks at a time in the winter, no issues. It runs better than 87 and is cheaper.

Pure Ethanol is about 76,000BTU/gal*
Pure Gasoline is about 116,000BTU/gal*
E10-blend is about 112,000BTU/gal*
E15-blend is about 110,000BTU/gal*
*Before detergents and octane boosters are added

E10->E15 will drop your fuel economy because there is simply less bang per gallon. You need more throttle and more fuel to resist the same amount of wind drag.
Your performance will also drop, depending on how much your engine adjusts to the new blend.

The bigger issue is that you may not save at the pump. A 10c free-market drop could be less than the amount of extra fuel you need to burn. More visits to the gas station will add up in time and money. Considering the idiots who will wait 30-min in line to save 3c/gal (45c for a 15-gal fill-up), you can imagine how much money they're losing just in time and idling their cars.

The main issue from running more ethanol is the heat generated is higher. If the engine isn't designed to handle it, then major issues can occur.

Actually, Ethanol burns cooler. It also burns cleaner....BUT....

...but, there is a problem that your exhaust catalyst may not heat up to its intended operating temperature resulting in more NOx, CO, and unburnt hydrocarbons. Toxic emissions could go up despite Ethanol being a cleaner fuel.

 

[ferraiolo1]

E10->E15 will drop your fuel economy because there is simply less bang per gallon. You need more throttle and more fuel to resist the same amount of wind drag.
Your performance will also drop, depending on how much your engine adjusts to the new blend.

How many tanks of e88 have you ran through your hemi?

Performance doesn’t drop, it’s still 88 octane. It pings less than 87 under load.

But by that logic running pure fuel should really bump up mpg numbers, right?

No, my mpg readings stayed relatively they same running pure fuel, 89, 87, and e88. Only thing that differed is how light my wallet was.


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[HEMIJAKE]

How many tanks of e88 have you ran?

Performance doesn’t drop, it’s still 88 octane. It pings less than 87 under load.

But by that logic running pure fuel should really bump up mpg numbers, right?

No, my mpg readings stayed relatively they same running pure fuel, 89, 87, and e88. Only thing that differed is how light my wallet was.


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Not performance, energy drops. In theory, it should take more fuel to achieve the same combustion. Might not be that noticeable for 10 to 15 % ethanol. When I went to e30 with my mustang, I lost 4-5mpg's.

 

[mikeru82]

How many tanks of e88 have you ran?

Performance doesn’t drop, it’s still 88 octane. It pings less than 87 under load.

But by that logic running pure fuel should really bump up mpg numbers, right?

No, my mpg readings stayed relatively they same running pure fuel, 89, 87, and e88. Only thing that differed is how light my wallet was.


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It does affect fuel economy, but it's likely that it won't be noticeable. We're talking about a difference in BTU's/gal of less than 2%. Ethanol provides approx. 30% lower mpg's than gasoline. So the difference will be less than 1 mpg, which is less than I see from one tank to the next. There are so many more variables involved with fuel economy that it would be difficult to notice the decrease you will have with e15. To say it doesn't affect fuel economy is inaccurate. It would be more accurate to say you probably won't notice the difference in fuel economy.

 

[ferraiolo1]

Now we’re just arguing semantics, A difference like that is so negligible you might as well say it doesn’t affect it. Remember we are talking about a 5% bump in e content. It’s insignificant.

I’ve yet to see some one post they are running e15 and their mpg dropped, all I’ve seen are people saying it’s stayed the same.

Kinda how saying adding a cat back doesn’t add performance. Sure it adds a very minimal amount. But it’s an amount no one will ever notice, thus it doesn’t add performance.



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[mikeru82]

Now we’re just arguing semantics, A difference like that is so negligible you might as well say it doesn’t affect it. Remember we are talking about a 5% bump in e content. It’s insignificant.

I’ve yet to see some one post they are running e15 and their mpg dropped, all I’ve seen are people saying it’s stayed the same.

Kinda how saying adding a cat back doesn’t add performance. Sure it adds a very minimal amount. But it’s an amount no one will ever notice, thus it doesn’t add performance.



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Not semantics, it's fact. But you're right about your anecdotal evidence that it doesn't appear to affect fuel mileage. Like I said, the difference is insignificant. No one will probably notice it.

 

[ferraiolo1]

I still hit my epa averages on my window sticker and I save around $15 every fill up and no engine pinging.

So I’ll keep using it.


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[mikeru82]

I still hit my epa averages on my window sticker and I save around $15 every fill up and no engine pinging.

So I’ll keep using it.


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I'm in no way trying to talk you out of using it. Use whatever makes you happy. Thankfully we still have a choice of fuels we can use. I use ethanol free for all my yard equipment. I'd use that in my truck too if it wasn't 50 cents to a dollar per gallon more than regular where I live.

 

[theblet]

If there ever is e88 around here, I would probably try it to see if my mpg goes down and how my engine runs. Sounds like it won’t make much of a difference.

 

[ferraiolo1]

I'm in no way trying to talk you out of using it. Use whatever makes you happy. Thankfully we still have a choice of fuels we can use. I use ethanol free for all my yard equipment. I'd use that in my truck too if it wasn't 50 cents to a dollar per gallon more than regular where I live.

Just trying to clear up the stigma that many members on this forum have about it.

Almost Everyone who has a negative opinion about how it will hurt the truck and lower your mpg hasn’t used it.

There are no I’ll side affects, especially on a modern vehicle.


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[mikeru82]

Just trying to clear up the stigma that many members on this forum have about it.

Almost Everyone who has a negative opinion about how it will hurt the truck and lower your mpg hasn’t used it.

There are no I’ll side affects, especially on a modern vehicle.


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Fair enough. My negativity towards it has less to do with the actual product, and more to do with the politics behind why it's being pushed out at this time.

 

[Ninety-9 SE-L]

How many tanks of e88 have you ran through your hemi?

Performance doesn’t drop, it’s still 88 octane. It pings less than 87 under load.

But by that logic running pure fuel should really bump up mpg numbers, right?

No, my mpg readings stayed relatively they same running pure fuel, 89, 87, and e88. Only thing that differed is how light my wallet was.


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• To start, None. I don't (yet) have a Ram and I'm buying a Diesel, but I've worked on cars/engines for 20 years, and I'm a Mechanical Engineer.
  
  
• Also, you're using the term wrong. E88 would indicate 88% Ethanol. The term is "Unleaded 88," which is 88-octane E15 (15% ethanol added to 84-octane gasoline).
  
  
• Ethanol is technically an Octane booster. I'm not sure why you're pinging under load, but "Pinging less" worries me. You shouldn't ping at all. Use 89+.
  
  
• I don't really have any comment on Unleaded 88, it is what it is, E15 with a slightly higher octane rating. Still, E15 has less energy than E10.
  
  
• Performance drops because there is less energy in every drop of fuel, you can't argue physics. It's a very small amount, but it is there.
  
  
• The power/economy difference is very small, but because the price difference is very small, it's worth the discussion. There's no point in losing 3% of your fuel economy just for the privilege of paying 2% less at the pump.
  
  
• Yes, by my logic, pure gasoline (E0) will yield more power output and take you further per tank. More energy per unit = less units used.
  
  
• Pure gasoline isn't worth the price, unfortunately. For the record, E0 isn't expensive because of the blend, it's expensive because of scarcity...it's much harder to find.
  
  
• 87-octane, 88-octane, and 89-octane has very little to do with fuel economy (technically, I'm not going into the details of variable timing and octane boosters).
  
  
• Seriously, stop calling it E88. It's an E15-blend with an 88-octane rating.
  
  
• Seriously, do something about that pinging.

 

[ferraiolo1]

Running 87 octane in the hemi is known to cause pinging under load. That’s why the manual recommends using 89 or higher.

So again, 88 runs similar to 89 and is cheaper than 87, with no side affects.

My local fuel stations carry e85, 87, 88, 89, 93 and efree 90. I’ve tried them all. Efree 90 is the same price as 93. All similar results, other than the amount of money in my bank account.

Of course talking about stock tuned vehicles.

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[Usmc041127]

With big brother allowing for e15 blended gas to be run all summer what are your thoughts? I haven't seen it here locally where I live. I don't believe I have ever ran it in anything I own.

What are the pros and cons?

I am fearing it will drive up the cost of corn along with the cost of gas already high more than anything.

It seems like anything that the Brandon administration does or changes makes things worse. But that is just my opinion.