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Old 06-29-2016, 06:39 PM   #1
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Regular or Permium Gas

I have a 2014 Mustang V6 and I got over 20k miles on it and I go to the pump 2 twice a week and use the premium so after a while I was wondering if there will be any different if I used regular gas instead of premium.
I drive fairly fast 70-80 freeway and 40+ anywhere else. I don't do racing unless it's on rare occasions with friends.
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Old 06-29-2016, 06:42 PM   #2
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That really depends on what mods if any and if you are using a tune. I also have a 2014 V6 and before I started adding the mods I was running 87 just fine. Now I only run 93 but I have several mods and I'm running a Bama Tune for 93.


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Old 06-29-2016, 06:48 PM   #3
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I'm running full stock
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Old 06-29-2016, 06:49 PM   #4
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More horsepower/torque from 93, other than that done run a lower octane that the tune you're running if you are.


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Old 06-29-2016, 06:57 PM   #5
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So I should be fine using 87 if I'm remind stock and dont remind having less hp/torque since I dont really race
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Old 06-29-2016, 07:11 PM   #6
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So I should be fine using 87 if I'm remind stock and dont remind having less hp/torque since I dont really race
Yep, even the 5.0s can run off 87 no problem. The timing isn't advanced as much on the stock tune on 87.


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Old 06-29-2016, 07:38 PM   #7
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Okay there shouldnt much of a different I assume and I can some money
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Old 06-29-2016, 07:51 PM   #8
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Okay there shouldnt much of a different I assume and I can some money
If you're not racing it, you won't notice a difference and the car will function just as well as if you put Premium in.


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Old 06-29-2016, 11:11 PM   #9
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Premium is only if you are doing something extreme like racing and stuff.
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Old 06-30-2016, 10:00 AM   #10
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You aren't getting more power out a V6 with 93, guaranteed. Run 87, you'll be fine.
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Old 06-30-2016, 10:04 AM   #11
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what they said. I tried premium in mine for a few fill ups 2x...once I saw a mpg improvement the 2nd time not. I run regular 98% of the time.
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Old 06-30-2016, 10:42 AM   #12
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93, it is reccomended but not necessary. it isn't even as much about HP or MPG which it technically helps with but longevity and engine cleanliness. I would unless it is financially a strain to pay the little more
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Old 06-30-2016, 11:23 AM   #13
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Luckily for you 87 is regular lol here in Colorado regular is 85.
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Old 06-30-2016, 12:36 PM   #14
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There is no reason to run anything more than 87 octane in your v6 unless you have an aftermarket tune that was set up for a higher octane. If you feel a difference switching from 87 to higher octane without a tune, your gas station has crap 87 and you shouldn't go there anymore.

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93, it is reccomended but not necessary. it isn't even as much about HP or MPG which it technically helps with but longevity and engine cleanliness. I would unless it is financially a strain to pay the little more
This is absolutely false, higher octane does not help with engine cleanliness, and only affects longevity if your car is tuned too aggressively and starts knocking. The exception being that certain brands of gas may add extra additives to their premium gas. This may help with cleaning but actually hurts octane.
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Old 06-30-2016, 01:01 PM   #15
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The 3.7, just like the 5.0, will adjust for higher octane. Both use the knock sensors to advance timing.

Earler models only a tune would make the adjustments.

Now, is it as much as tuning? On either platform you really won't notice the extra 10 or 15 horsepower.

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Old 06-30-2016, 01:03 PM   #16
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Even on the 2016 models, Ford rates the 300hp at 87 octane. They specifically state premium recommended next to the ecoboost and 5.0 hp ratings.
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Old 06-30-2016, 02:04 PM   #17
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The 3.7, just like the 5.0, will adjust for higher octane. Both use the knock sensors to advance timing.

Earler models only a tune would make the adjustments.

Now, is it as much as tuning? On either platform you really won't notice the extra 10 or 15 horsepower.

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It won't infinitely adjust timing up for increased octane. There is a very small amount of upward adjustment allowed for but, it's capped tightly and won't increase power meaningfully.
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Old 06-30-2016, 02:06 PM   #18
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93oct the only way to go!!
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Old 06-30-2016, 02:06 PM   #19
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What is permium? Some new type of fuel? hehe

93 Tuned, 87 stock.
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Old 06-30-2016, 02:30 PM   #20
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It won't infinitely adjust timing up for increased octane. There is a very small amount of upward adjustment allowed for but, it's capped tightly and won't increase power meaningfully.
And that is what I said. The increase isn't enough to really notice. It's there, but without a tune not enough to make a difference on either platform

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Old 06-30-2016, 02:44 PM   #21
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My car has a 91 octane tune and I run 93.

There are no special cleaning agents, super power additives, or any other mythical advancement to higher octane fuel. In simple terms, the higher the octane number, the slower the fuel detonates.

The best example I can give is this; an engine with a high compression ratio needs a fuel that is stable under extreme pressure. If you run a low octane fuel in a high compression engine the fuel can ignite in the cylinder before the piston strike is complete. Now you have a downward force on an upward moving object that is connected to the other pistons via the crank shaft.

Several bad things can happen in this situation. Rods can bend or break. Bearings can be flattened out and destroyed. Head gaskets can blow. Cylinder walls can be scratched. Sometimes blocks themselves can crack.

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Old 06-30-2016, 03:35 PM   #22
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I have a 2012 V6 and never run premium, I had a 2011 5.0 and also ran regular. In the V6 you are not going to gain anything by running premium, if you engine does not knock, which it should not do in a V6 running regular, the management system will not ****** your timing which cause you to loose power. In my 5.0 I'm sure I lost power as the computer probably retarded my timing to keep the engine from knocking. A gallon of premium does not have any more energy in it than regular, unless of course you get premium without ethanol as ethanol does not have as much energy as gasoline. Save your money and run regular until you make some type of modification that requires you to use gas that will withstand higher pressures before igniting.
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Old 06-30-2016, 03:57 PM   #23
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Originally Posted by Sterlingbeast5.0 View Post
93, it is reccomended but not necessary. it isn't even as much about HP or MPG which it technically helps with but longevity and engine cleanliness. I would unless it is financially a strain to pay the little more
This is indeed a myth/lie, and could not be any further away from the truth.

Octane is not a measurement of power or cleanliness, simply the ability to resist igniting prematurely. Which is needed in high compression and turbo applications.

Detergents in fuel do not have anything to do with octane rating, the gas supplier does.

Companies that use above the number of average detergents are listed on the "Top Tier Gas" website. Examples include Shell, Exxon, BP, and Chevron.


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Old 06-30-2016, 05:33 PM   #24
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Now we are all repeating one another using different phrasing.

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Old 06-30-2016, 06:31 PM   #25
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Companies that use above the number of average detergents are listed on the "Top Tier Gas" website. Examples include Shell, Exxon, BP, and Chevron.


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I wonder if the place where I buy gas is on that list???

"Mo's Liquor"
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Old 06-30-2016, 06:58 PM   #26
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Now we are all repeating one another using different phrasing.

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I'd prefer 1 wrong and 10 right posts than 10 wrong posts and 1 right, leading the OP to believe the wrong information to be true.


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Old 06-30-2016, 07:06 PM   #27
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Regular or Permium Gas

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Originally Posted by Jon3.7 View Post
What is permium? Some new type of fuel? hehe

93 Tuned, 87 stock.
ERR MUH GERD PERMIUM!!!
I only put Premium in when my sis borrows my car. I tell her, "Fill it to the top, & DO NOT get regular!!" hee hee...
(lol never saw the forum. my bad. again.)
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