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Any advantage to using premium fuel

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eezram

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H/O Recommends premium for full power, but is there any advantage in the S/O? I have heard and seen conflicting reports. Maybe premium fuel while towing a decent size load? Thoughts on this and what if any advantage premium fuel might give.
 
Purely anecdotal evidence here but I gave it a try in my S/O a few times when I was towing and/or it was hot outside (per the recommendation from the owners manual) and I seemed to get worse milage but I might have noticed some more power. Hard to say for sure, it might have been in my head as well. I don't see the need to spend the extra money on premium fuel. In my area we typically see 87 as regular, 91 as premium, not too common to see 93.

I think we switched over to winter blend fuel in my area recently because I noticed a 1-2 MPG decrease per the trip average MPG in the cluster but I would see similar results in the Hemi when it was winter blend.
 
HO requires premium without exception.
 
Pardon my ignorance, what does "more timing" mean?
 
kwill said:
Pardon my ignorance, what does "more timing" mean?
Click to expand...
When running a lesser octane, the engine may advance timing to prevent pinging.

What does the manual say? For the hemi it says to run premium for full power. I only use it when towing something heavy. Haven’t noticed any real difference in mpg with either, so it’s not worth the money for me to run premium full time.
 
theblet said:
What does the manual say? For the hemi it says to run premium for full power.
Click to expand...
Unless i missed it in the owners manual, Or it changed for the 24s, the recommended fuel for the 5.7 hemi is 89 (mid grade) but it says 87 is acceptable. 85 is a nogo
 
Gren71 said:
Unless i missed it in the owners manual, Or it changed for the 24s, the recommended fuel for the 5.7 hemi is 89 (mid grade) but it says 87 is acceptable. 85 is a nogo
Click to expand...
Oh yes, sorry it is 89 for full power not premium.

1729475363738.png
 
I’ve ran both 87 and 93 in my SO. Minimal noticeable difference. Perhaps a bit of power loss on the top end and a tiny mpg loss on 87. Nothing worth sticking to 93.
 
You can run 87 but if you like to get the most performance from the SO with 22 psi of boost then run premium.
I've had a Challenger Scat Pack and the 392 Hemi used 93 octane so it's no big deal to me.
 
Personally, I'm going to run 87 most of the time. When I tow my boat next June, I'll switch to premium to achieve optimal performance, as suggested in the owner's manual. Would be nice if TFL or someone did a few 1/4 mile runs with two trucks...one with 87 and one with 91-93. My guess is there is a negligible performance difference when weighing against the price difference.
 
I just figure with a high compression engine, running the higher octane to reduce detonation would be the safer bet. Part of me feels like they say you can run regular to not turn away buyers, but ultimately not good. I know the sensors can retard and advance timing, but I don’t know if I could bank on that either.
 
I know the owners manual says 87 is fine but Direct Connection says premium for the 420HP S/O Hurricane.
Hurricane3-40.jpgHurricane3-41.jpg
 
Last edited:
theblet said:
When running a lesser octane, the engine may advance timing to prevent pinging.

What does the manual say? For the hemi it says to run premium for full power. I only use it when towing something heavy. Haven’t noticed any real difference in mpg with either, so it’s not worth the money for me to run premium full time.
Click to expand...
It actually retards timing to prevent detonation, not as advances. Advancing timing can increase performance.
 
f_martinek said:
Purely anecdotal evidence here but I gave it a try in my S/O a few times when I was towing and/or it was hot outside (per the recommendation from the owners manual) and I seemed to get worse milage but I might have noticed some more power. Hard to say for sure, it might have been in my head as well. I don't see the need to spend the extra money on premium fuel. In my area we typically see 87 as regular, 91 as premium, not too common to see 93.

I think we switched over to winter blend fuel in my area recently because I noticed a 1-2 MPG decrease per the trip average MPG in the cluster but I would see similar results in the Hemi when it was winter blend.
Click to expand...
It takes more than one tank of fuel for the computer to fully adjust the adaptives for different grades if fuel. Need to do a minimum of three tanks and keeping track of mileage and performance to get a good average for comparison
 
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