Premium vs regular gas

socalexpeditions · Sep 8, 2022

Just put in whatever it asks for!

DILLIGAF · Sep 8, 2022

I run 93 since im tuned for 91 , never had a ping issue since.

If it asks for 87 step it up to 89, a simple data log will show you that it in fact does help.

CheechDogg.0n37s · Sep 8, 2022

ramffml said:
They must, yes, but it's not a perfect thing otherwise we wouldn't be able to still hear knock/pinging.

Despite having sensors and what I consider a brand new engine (< 20,000 miles) I still heard and continue to hear pinging.

I rather it not adjust anything and lose power by "retarding" the system ... I rather go up and get all the power we can possible get and I am convinced with 91 that is exactly what happens ... but some people rather save money now than avoid issues later down the road ..

Like I said, I will be going back to 91 next fill up and staying with it and will pay close attention to the differences in doing so, but I know for a fact there was loss in power and MPG due to using 89 for a whole year ... I kindah regret staying with 89 for a whole year but I wanted to see what the differences were .....

CheechDogg.0n37s · Sep 8, 2022

HEMIMANN said:
Yes, but the knock is very slight in the control feedback loop. When we think about knock, we're thinking of the audible rapping sound many of us have experienced. The knock sensors adjust timing way before that point.

I quoted the wrong post lol ..

Yes, we know the knock is very light and quite honestly I am sure even with the recommended octane and even going to 91 at some point there is going to be knocking ... but I rather it not get "********" and lose power at the same time ... my truck on 91 gets better MPG and more power ...

I am not the only one that feels this way ...

HEMIMANN · Sep 8, 2022

ramffml said:
They must, yes, but it's not a perfect thing otherwise we wouldn't be able to still hear knock/pinging.

Despite having sensors and what I consider a brand new engine (< 20,000 miles) I still heard and continue to hear pinging.

Interesting! No one can hear pinging in my Hemi engine on 87 octane gas. Not even my young guys with good hearing.

Do you suppose they modified the ignition timing algorithm over the years to be more sensitive? Mine is 2017 model year.

CheechDogg.0n37s · Sep 8, 2022

HEMIMANN said:
Interesting! No one can hear pinging in my Hemi engine on 87 octane gas. Not even my young guys with good hearing.

Do you suppose they modified the ignition timing algorithm over the years to be more sensitive? Mine is 2017 model year.

The pinging, knocking is something not all of us can hear, feel or detect just with our ears , that is what a lot of people don't understand .... most of the time the knocking, pinking can only be confirmed with data logs .....

Unless you get a data log reading of your truck none of us can say that our trucks are not knocking, pinging or getting ******** .... even on 91 there is going to be some kind of pinging, knocking and it has been proven with data logs even on tuned vehicles running the octane for that tune ....

ramffml · Sep 8, 2022

HEMIMANN said:
Interesting! No one can hear pinging in my Hemi engine on 87 octane gas. Not even my young guys with good hearing.

Do you suppose they modified the ignition timing algorithm over the years to be more sensitive? Mine is 2017 model year.

I'm not sure. And to be perfectly honest, I'd be hesitant to believe my ears if it weren't for that video that was posted (and others like it) which show guys data logging their computer and getting all kinds of ping on 87, less as they move up on octane. That's what my ears hear as well, but it never dissapeared even when I ran 91 though it was quite rare then.

I suspect there is a combination of factors at play, including gas quality, ethanol content, elevation, temperature, humidity? I just know that I never hear it when engine is cold, but I hear it the most when I'm pulling my trailer.

I do hear it when I "get on it" when running with no load either. It's one of the reasons I continue to experiment with oil, knowing that calcium can be a factor in DI (shouldn't effect the hemi)... but if oil formula can have an effect in LSPI then I'm willing to try a little and see if there is any difference. HPL has lower amounts of calcium vs RL, but I'm not really expecting there to be a reduction in ping once I get the HPL oil in.

turkeybird56 · Sep 8, 2022

I just a simple BOIRD. RAM says recommended 89, I run 89, never deter. But my truck is a driveway princess, so do not have many of the issues other folks have working the truck as a truck, etc.,.

CheechDogg.0n37s · Sep 8, 2022

turkeybird56 said:
I just a simple BOIRD. RAM says recommended 89, I run 89, never deter. But my truck is a driveway princess, so do not have many of the issues other folks have working the truck as a truck, etc.,.

Oh I hear yah... again nothing wrong with running 89 ..but what I wont run is 87 on my truck ...FAWKTHAT! ...

If I hadn't notice the drop in MPGs and power I would of stayed with 89 because again, I know that there is also going to be pinging, knocking even with 91

ramffml · Sep 8, 2022

socalexpeditions said:
Just put in whatever it asks for!

Mine asked me for beer the other day but I had to turn her down, can't have 2 drunks running the rig!

turkeybird56 · Sep 8, 2022

CheechDogg.0n37s said:
Oh I hear yah... again nothing wrong with running 89 ..but what I wont run is 87 on my truck ...FAWKTHAT! ...

If I hadn't notice the drop in MPGs and power I would of stayed with 89 because again, I know that there is also going to be pinging, knocking even with 91

OH NO, no 87. I would get ethanol free, but only 1 station in town has it, and they ARE not known for taking care of their tanks, so guess stick with Shell or Sunoco 89. All my Stihl tools and my mower the recommended grade is 89, so I just do 89 on all, and all my cans filled with 89, which also power my portable genny also. Guess just an 89 type BOIRD, wateva that a be. :Big Laugh:

runamuck · Sep 8, 2022

I am pretty sure I have always run regular in every truck I've owned except maybe one or 2 tanks when towing in extra hot weather. never a problem

HEMIMANN · Sep 8, 2022

ramffml said:
I'm not sure. And to be perfectly honest, I'd be hesitant to believe my ears if it weren't for that video that was posted (and others like it) which show guys data logging their computer and getting all kinds of ping on 87, less as they move up on octane. That's what my ears hear as well, but it never dissapeared even when I ran 91 though it was quite rare then.

I suspect there is a combination of factors at play, including gas quality, ethanol content, elevation, temperature, humidity? I just know that I never hear it when engine is cold, but I hear it the most when I'm pulling my trailer.

I do hear it when I "get on it" when running with no load either. It's one of the reasons I continue to experiment with oil, knowing that calcium can be a factor in DI (shouldn't effect the hemi)... but if oil formula can have an effect in LSPI then I'm willing to try a little and see if there is any difference. HPL has lower amounts of calcium vs RL, but I'm not really expecting there to be a reduction in ping once I get the HPL oil in.

@Sherman Bird - have you checked for 87 octane knock on Hemi under acceleration? Thought you were into datalogging, which is why I ask.

jimmerz76 · Sep 15, 2022

rog007 said:
I have a 2022 Ram pickup with 5.7 L std V8. I started with premium gas - 93 octane as I thought in the long run it would be better for the engine. Manual says regular gas 87 octane is ok.

Now I'm at 6.00 per gallon, the 33 gallon tank is $200.00.

Does anyone know how it impacts the engine to switch back to regular? What are the negatives?

i am a little late to this party, but i have a 19 tradesman with the 5.7 and it runs like garbage on anything less than 91. i have switched back and forth the only noticeable difference is on the lower stuff when i put my foot into it to pass someone it sounds like a bag of baby rattles. on the 93 it does not do that.

CheechDogg.0n37s · Sep 15, 2022

jimmerz76 said:
i am a little late to this party, but i have a 19 tradesman with the 5.7 and it runs like garbage on anything less than 91. i have switched back and forth the only noticeable difference is on the lower stuff when i put my foot into it to pass someone it sounds like a bag of baby rattles. on the 93 it does not do that.

They all will people just don't realize it because they don't have the means to confirm that these engines don't like running on 87 and 89 .... I just went back to 91 and I can already feel the difference .. I ran 89 for the last year to see how it would do, didn't like it at all ... 91 from now on

runamuck · Sep 17, 2022

must be luck of the draw..I use regular and my '19 runs great. I get 20 a lot when on the highway and I get 8.5-10 towing our 6000# travel trailer depending on the terrain and whether I stay under 70..sweet spot towing seems to be around 68..

ramffml · Sep 17, 2022

runamuck said:
must be luck of the draw..I use regular and my '19 runs great.

I think what we're all trying to politely suggest, is that "I think my truck runs great" is not the same as "my truck runs great". Unless you've verified it via the logs of your ECU, you may not simply notice your truck running worse on one vs the other.

I will definitely agree that there are more variables at play however, I swear my truck has far less pinging now that I did the AGS delete, and the only thing that I can think of there is that the engine bay itself is much cooler, giving cooler air to the engine and thereby reducing knock. My engine oil itself is only 3 to 4 degrees C cooler, but possibly the air it's getting now is much cooler.

That was never mentioned in the AGS delete threads that I read, and I hope somebody smarter than me is able to look into that.

Docwagon1776 · Sep 17, 2022

For funsies, temperature and elevation may be relevant to the conversation.

I've decided I don't spend enough on gas and will be rectifying that soon.

turkeybird56 · Sep 17, 2022

Docwagon1776 said:
For funsies, temperature and elevation may be relevant to the conversation.

I've decided I don't spend enough on gas and will be rectifying that soon.

Just put some 89 in the Beast. No issues, but I will neva run 87, that is noticeable even to this BOIRD.

HEMIMANN · Sep 17, 2022

turkeybird56 said:
Just put some 89 in the Beast. No issues, but I will neva run 87, that is noticeable even to this BOIRD.

What do you notice?

Premium vs regular gas

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