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Old 07-03-2015, 02:10 PM   #1
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92 vs 93 octane question

There are very few gas stations in the state of WA. that carry 93 octane gas, as they all carry 92 octane. I know that the knock sensor for the engine is able to pull timing if it detects any knock, but my questions are these.......I know that Ford says the 5.0 "requires" 93 octane. right?

Will 92 octane do any long term damage to the engine?

How much performance am I leaving on the table running 92?

Is the 5.0 a flex fuel engine, and will it run OK on both 10% ethanol and ethanol free gas?

Thanks in advance for any help here......
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Old 07-03-2015, 02:48 PM   #2
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Ford says the new 5.0 engine is fine on 87 octane. For max performance, use 93. I go back and forth without any issues at all. The owners manual even calls for 87.


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Old 07-03-2015, 02:55 PM   #3
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On factory tune you can run 87 or 93 like mentioned above. There's maybe like a 8 to 10 whp jump from 87 to 93 if i can remember. 92 is fine. My car ran fine with 10% ethanol mix. Most gas is. If I'm not mistaken the wideband is adjusted for the 10% ethanol mix or mine is anyway. If you have a tune that requires 93 then you'll need to run 93.

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Old 07-03-2015, 06:43 PM   #4
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Originally Posted by Guard 5.0 View Post
There are very few gas stations in the state of WA. that carry 93 octane gas, as they all carry 92 octane. I know that the knock sensor for the engine is able to pull timing if it detects any knock, but my questions are these.......I know that Ford says the 5.0 "requires" 93 octane. right?

Will 92 octane do any long term damage to the engine?

How much performance am I leaving on the table running 92?

Is the 5.0 a flex fuel engine, and will it run OK on both 10% ethanol and ethanol free gas?

Thanks in advance for any help here......
The Mustang is NOT a "Flex Fuel" vehicle, meaning, you can't put E85 in it (without extensive modifications).
It does however run just fine on regular gasolines from 87,89,91,92 and 93. All of these contain 10% Ethanol unless you find the rare gas stations which still offer ethanol free gas. If you have access to one ,I would buy any grade of ethanol free over higher octane.

*I drove a free Ford test vehicle that ran only on E85 as well as many of my coworkers. Those vehicles were all junk within 6 months due to fuel related issues. This was a few years ago as Ford adjusted how they built their Flex fuel vehicles but the experience convinced me that Ethanol in my vehicles, lawn mowers, boat motors etc is NOT a positive thing. (Unless you're a corn farmer selling that crap).
Look here for your states stations that have ethanol free gas.
http://www.buyrealgas.com
Or here
http://pure-gas.org
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Old 07-03-2015, 06:59 PM   #5
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You do not need "extensive modifications " to run e85. And it's far from crap

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Old 07-03-2015, 10:12 PM   #6
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The Mustang is NOT a "Flex Fuel" vehicle, meaning, you can't put E85 in it (without extensive modifications).
It does however run just fine on regular gasolines from 87,89,91,92 and 93. All of these contain 10% Ethanol unless you find the rare gas stations which still offer ethanol free gas. If you have access to one ,I would buy any grade of ethanol free over higher octane.

*I drove a free Ford test vehicle that ran only on E85 as well as many of my coworkers. Those vehicles were all junk within 6 months due to fuel related issues. This was a few years ago as Ford adjusted how they built their Flex fuel vehicles but the experience convinced me that Ethanol in my vehicles, lawn mowers, boat motors etc is NOT a positive thing. (Unless you're a corn farmer selling that crap).
Look here for your states stations that have ethanol free gas.
http://www.buyrealgas.com
Or here
http://pure-gas.org
The only modifications needed are 47lb injectors, and a tune. FAR from extensive.

It's definitely not crap. Basically cheap race gas. Let's you increase timing safely, since it would be a higher octane level than 93. Basically the only downside is a few MPG loss.
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Old 07-03-2015, 11:56 PM   #7
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im sure it has performance gains. The fleet vehicles Ford gave us that only used E85 had serious issues time after time over a two year period. Most were crushed after 6 months or so and you got a new one with more tweaks and attempts to make them marketable to the public. The vehicles were: Taurus SHO, CVPI, Mustang 4.0, Expedition 5.4
We went through about 30 of them.
Don't forget E85 and the 10% blend wasn't started because it's a miracle drug, it was forced by the gub-mint.
Your long term experience just running E85 may not leave you happy with it.
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Old 07-04-2015, 04:39 AM   #8
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Originally Posted by Guard 5.0 View Post
There are very few gas stations in the state of WA. that carry 93 octane gas, as they all carry 92 octane. I know that the knock sensor for the engine is able to pull timing if it detects any knock, but my questions are these.......I know that Ford says the 5.0 "requires" 93 octane. right?

Will 92 octane do any long term damage to the engine?

How much performance am I leaving on the table running 92?

Is the 5.0 a flex fuel engine, and will it run OK on both 10% ethanol and ethanol free gas?

Thanks in advance for any help here......
Sir, where did you read that the 5.0 needed 93 octane or better yet where did you read this from Ford.

I am the worlds defender of the 3.7 V6 model.
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Old 07-04-2015, 11:43 AM   #9
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Been running straight e85 in my 10 sec street mustang for years....zero problems.
My 2011 flex fuel F150 has run Gasoline, E85 and any mix in between perfectly since....2011. e85 is awesome.
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Old 07-04-2015, 01:54 PM   #10
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Sure is a lot of misinformation about e85.
I wonder how many of these "experts" have actually run e85 for any length of time....
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Old 07-04-2015, 01:55 PM   #11
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I somehow doubt he will ever replace his carburetor..
Lol I agree with you hahaha hahaha

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Old 07-04-2015, 01:56 PM   #12
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I somehow doubt he will ever replace his carburetor..
In all my years of running e85 I have never had to replace my carburetor. LOL.
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Old 07-04-2015, 02:01 PM   #13
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IF YOU DONT MIND 1/3 LESS MILEAGE ON YOUR CAR.ALSO YOU WILL REPLACE CARBURATOR YEARLY ON YOUR SMALL ENGINES DUE TO CORROSION FROM THE ALCOHOL DRAWING WATER TO YOUR TANK.

No one runs E85 for good mpg. They run it because they are going to be faster than you.

I'm gonna pull a Rapinator....

Go ahead and be slow.


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Old 07-04-2015, 02:01 PM   #14
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I somehow doubt he will ever replace his carburetor..
Lol.
I think that he is referring to gas powered equipment that might sit for extended periods of time between being used. Lawnmowers, roto-tillers, old tractors, generators, things like that.
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Old 07-04-2015, 02:02 PM   #15
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In all my years of running e85 I have never had to replace my carburetor. LOL.
Hey you never know :p let me know if you find it though lol

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Old 07-04-2015, 02:12 PM   #16
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No one runs E85 for good mpg. They run it because they are going to be faster than you.

I'm gonna pull a Rapinator....

Go ahead and be slow.


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:thumbup::thumbup:

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Old 07-04-2015, 10:29 PM   #17
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What happened?
Did he delete his posts or did a mod take him out back and shoot him?
I reported him/her to the mods as being kind of confrontational here.........one of them must have cleaned up the thread............thanks, mods!
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Old 07-04-2015, 10:35 PM   #18
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I have always been curious, can I report a post and effectively tag Scotty and soccer? Lol
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Old 07-04-2015, 10:39 PM   #19
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I have always been curious, can I report a post and effectively tag Scotty and soccer? Lol

The little exclamation point in the red triangle in the lower left corner of every post is there to report a post that needs it. Click on it, and you can then comment why you are reporting it and request the mods take some kind of action....
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Old 07-04-2015, 10:39 PM   #20
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Wasn't me. Be he's been notified and posts were deleted.


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Old 07-04-2015, 10:41 PM   #21
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The little exclamation point in the triangle in the lower left corner of every post is there to report a post that needs it. Click on it, and you can then comment why you are reporting it and request the mods take some kind of action....

Some of us use the app. It doesn't show you that on the app. At least mine doesn't.


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Old 07-04-2015, 10:48 PM   #22
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Some of us use the app. It doesn't show you that on the app. At least mine doesn't.


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Mine doesn't either
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Old 07-04-2015, 10:52 PM   #23
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Mine doesn't either
Can you send PM's on the app?
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Old 07-04-2015, 10:54 PM   #24
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Can you send PM's on the app?
Yes

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Old 07-04-2015, 11:22 PM   #25
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You just have to tap the comments and hit the three dots at the top of the screen
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Old 07-05-2015, 05:23 AM   #26
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play nice or thread will be closed.
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Old 07-05-2015, 05:26 AM   #27
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Guard, back to your original question...you can run either and on the street there will be no noticeable difference.
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Old 07-05-2015, 08:54 AM   #28
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Guard, back to your original question...you can run either and on the street there will be no noticeable difference.
We now return you to your regularly scheduled program.......
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Old 07-05-2015, 02:43 PM   #29
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Do you guys have any 93 stations out that way? We don't have any out hrrr
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Old 07-05-2015, 02:47 PM   #30
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We have them here.


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Old 07-05-2015, 03:06 PM   #31
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91 only here in California.

California:
Home of the strictest emissions in the world and the crappiest gas in the country.

Why?
Because you don't need a fast car to support illegal immigrants, Silly.
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Old 07-05-2015, 04:56 PM   #32
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91 only here in California.
Highest here in Anchorage is 90. And it's crap 90 at that lol.
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Old 07-05-2015, 04:58 PM   #33
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Highest here in Anchorage is 90. And it's crap 90 at that lol.
I stand corrected....gas gets even crappier up north.
How's the Illegal alien situation up there?
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Old 07-05-2015, 06:10 PM   #34
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For those living in the higher elevations, it is not uncommon to see only lower octane fuel available at most gas stations. This is due to the lower cylinder pressures that are experienced at higher altitudes. It becomes less necessary to reduce the speed of the flash point of gasoline, by raising the octane rating. The higher the elevation, the lower the air pressure. It is the high cylinder pressure that, in most cases, causes detonation, thus requiring a raised octane rating to compensate for it.
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Old 07-05-2015, 06:13 PM   #35
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Anchorage is near sea level though lol

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