What octane do y'all run?

[AngryRams]

Running a 5.7L with KN CAI and aftermarket exhaust... Truthfully I don't even know what kind. I've briefly looked but I don't see any stamps. It sounds amazing though...

I was thinking of filling up with 91oct today.. any benefits?

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[RedSRT4Me]

None. Only way your going to take advantage of 91 octane is with a tuner that adjusts ignition timing and fuel trims

 

[AngryRams]

None. Only way your going to take advantage of 91 octane is with a tuner that adjusts ignition timing and fuel trims

That's the thing.... I don't know if my truck is tuned or not. It came modded already...

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[Gr8bawana]

It will just put a bigger dent in your wallet when you fill up.

 

[AngryRams]

Yeah, I think 91 is around $3.40/g right now

It will just put a bigger dent in your wallet when you fill up.

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[RedSRT4Me]

That's the thing.... I don't know if my truck is tuned or not. It came modded already...

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We won't know if it's tuned either.

You'll have to do your homework from the previous owner

 

[Wahrsuul]

I started out running 89 as that's what is suggested by FCA. But lately I've been running 87 to see if it makes a difference. As of now, I'm not seeing any change in performance or MPG.

Buying higher octane gas when you don't need it is just throwing away money.

 

[crackerjack1957]

Sometimes previous owner receipts in glove box with name, address & or phone #

 

[yortnodnarb]

I started out running 89 as that's what is suggested by FCA. But lately I've been running 87 to see if it makes a difference. As of now, I'm not seeing any change in performance or MPG.

Buying higher octane gas when you don't need it is just throwing away money.

I did the same thing and came up with the same conclusion.

 

[BiGMERF]

In my pentastar, 87. Tried 91 and felt no difference. Certainly nothing that warrants the extra money. Gas is expensive enough


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[Booms]

93 Octane all the time. Greene tuned.

 

[VB712]

93 Sunoco here. Custom tuned

 

[Jwithing]

93 octane hemifever tune.

I personally wouldn't risk engine knock by running lower octane. While modern day sensors do a much better job, there's still a risk. Also, there is the potential for ecu calibration to consume more gas to compensate, potentially negating any cost savings. Just my two cents.

 

[Fitz-0518]

89 stock 5.7 and 6.4

 

[bassheadhemi]

91 ethanol free, tuned

 

[BigRed4x4]

89 custom tune but I'll put in the 87 tune for road trips.

Before the tune it was 87. No reason for anything else without a tune to match the octane.

 

[Saltillo Express]

Is MDS working? If not it may be tuned. Lot of cats turn it off in the tune.

 

[AngryRams]

Is MDS working? If not it may be tuned. Lot of cats turn it off in the tune.

You mean eco mode? Ya

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[69GWC]

89 just like the 5.7 Hemi calls for.

 

[AngryRams]

89 just like the 5.7 Hemi calls for.

Ooo wise guy! Jk lol I just filled up w 89 my truck gets really terrible mileage

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