87 Or Higher Octanes For The 5.0?

fmdog44

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Just read through my manual and saw "for best results" run higher octane. I will fill up for the first time tomorrow with 91 octane just to see the difference. I have been running on the dealership gas and assume it is 87. Comments?





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SuvE

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I use 87 and average about 24mpg highway. Platinum 4x2.

No plans to change.
 

Merccat

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I plan to use 87 for regular daily driving, 91 when traveling over high altitude and/or towing.
 

nyctpt

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I run 87, haven’t tried anything else but it’s been fine.

Ryan
 

F150ROD

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E85
 
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fmdog44

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When I had my short bed 04 Hemi I had a difference in performance between the different octane levels. As far as top tier gas I would like to see a study stating the brands of lesser quality. I think you will find there is no suck study. Gas is the same only the additives may differ.
 

KartRacer25

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I'm running Mobil 91 Octane.
Expensive.
My mind and wallet say, If it doesn't knock on top tier (additives) 87 its probably fine.
But I love my 302 so much I just cant bare to put anything less in it yet.
 
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fmdog44

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I'm running Mobil 91 Octane.
Expensive.
My mind and wallet say, If it doesn't knock on top tier (additives) 87 its probably fine.
But I love my 302 so much I just cant bare to put anything less in it yet.
I agree because I bought a reg. cab 5.0 for street performance and 91 is better for it and the engine overall.
 

Jbrantner

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I’m surprised I only saw one comment for E85 on this. Depends on what you are looking for, MPG or Power. Stick with 87 for MPG. I’m running E85 and I like it.
 

Missmy3/4ton

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When I had my short bed 04 Hemi I had a difference in performance between the different octane levels. As far as top tier gas I would like to see a study stating the brands of lesser quality. I think you will find there is no suck study. Gas is the same only the additives may differ.
It would be nice to know what the 'lesser' brands are but who's going to pay for that? VS them paying to have their fuel certified and more people willingly pay more for better quaintly. I kid you not, I gain 3 mpg in my Ram 2500 by switching from Sam's club to Costco. I only run costco 83 and I get 21/22 highway in 5.0 doing 70-80. That Ram got the same MPG with speedway gas...
 

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