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Old 03-09-2016, 12:42 PM   #1
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Switching regular gas to premium

Hey, I want to try to use premium gas on my bone stock mustang just to see if it makes any difference. Would it be okay to try premium fuel once and then switch back to regular? Is there anything I need to do before switching to premium? Sorry for the noob question but I just want to make sure nothing happens to the car


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Old 03-09-2016, 12:50 PM   #2
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Its fine

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Old 03-09-2016, 01:09 PM   #3
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It's not a problem, the stock tune will adjust to the octane level automatically. I thought that was a great feature of our 3.7L engines
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Old 03-09-2016, 01:21 PM   #4
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You have to buy me a sandwich or it'll explode your motor.

you'll be fine. I run premium once in a while but my butt dyno or math mpg didn't notice any difference.
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Old 03-09-2016, 02:07 PM   #5
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You're good
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Old 03-10-2016, 08:54 AM   #6
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If you REALLY want to feel a difference, get a 93 octane tune. Trust me.


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Old 03-10-2016, 11:29 AM   #7
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Mine gained only 4 HP on the Dyno

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Old 03-10-2016, 11:31 AM   #8
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That was from 87 to 91, I'm running 93 now and wonder if there are any more gains but since I got upgrades it would be impossible to know now

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Old 03-10-2016, 01:20 PM   #9
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I tried it a whole ago, 87 octane to 93 octane Shell.
I found "NO" difference at all in "MILES PER GALLON"
I found that my Mustang ran exactly the same.
All it did for me was cost more to fill my tank.
I have "NO" tune and Magnaflow streets and the Airaid CAI.
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You may find a difference with a V8, But they call for premium gas anyway. I would probably only run 93 Shell if I had a 5.0.
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Old 03-10-2016, 01:37 PM   #10
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There's a video somewhere that shows that just adding 93 octane gains something like 8 hp and 6 tq. I'm too lazy to find the link though.


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Old 03-10-2016, 01:49 PM   #11
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Yep. American Muscle has a video somewhere using 87 octane then switched to 93 octane. 93 octane made 8 wheel horsepower more.
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Old 03-10-2016, 03:12 PM   #12
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Like I said, I did not physically feel any difference at all. Eight horsepower - I really don't think so. Maybe a few but not worth the cost involved.
I did run four tank-full's so it was a pretty good tryout.
If you can find that eight horsepower article, We all would be interested in seeing it.
Four is more like it because that is so low it would make no noticeable difference.
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Old 03-10-2016, 03:45 PM   #13
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Sorry, it was 7 wheel horsepower. On the video start at around 2:15, they talk about 87 vs 93 octane https://youtu.be/adSx7MGTecE
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Old 03-10-2016, 03:53 PM   #14
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I've only put 91 premium in since I bought it new with the exception of once and didn't like the way it felt. It felt a little sluggish with 87, was probably all in the head as I'm no expert so I ran that tank down and refilled with 91.
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Old 03-10-2016, 06:02 PM   #15
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That settles it, Over 4,500 you may or may not get 7 horsepower increase.
It would have been better if they did "NOT" fool with the timing and just did the test "FACTORY STOCK"

Still, if you want to feel a difference - You need a 93 octane tune, A Cai and a good set of mufflers. Then it would be worth the extra 45 or 50 cents a gallon.

At 7 HP over 4,500 RPM your better off with 87 octane and save some $$$$
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Old 03-10-2016, 06:23 PM   #16
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Been running 93 since I bought it. It's only about 6-7 more per fill up x 2 a month give or take. 14 x 12 = 168. Not awful per year but definitely extra money nonetheless. Having run 93 for going on 3 years now, I'm scared she won't like 87 too much >


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Old 03-10-2016, 06:37 PM   #17
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That would be closer to mine, like I said, I only gained 4 from 87 to 91, no tune so it makes sense it would be 6 to 7 with 93. You can't hardly tell a difference in hp unless you ad 20 or more hp. I did feel the difference when I added the 3 inch Borla racing exhaust but not with gas alone. Although you should realize that 93 on yours (+7hp) vs 87 on someone elses is always to your advantage, just saying

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Old 03-10-2016, 07:45 PM   #18
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Spoil the car, gas is cheap now.
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Old 03-10-2016, 08:40 PM   #19
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There's a video somewhere that shows that just adding 93 octane gains something like 8 hp and 6 tq. I'm too lazy to find the link though.


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Dude, you are KILLING me... no 93 in my crap city.
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Old 03-10-2016, 08:56 PM   #20
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It's like eating Bologna or steak. Yeah you can get full on Bologna but why when there's steak. Lol. (That's a joke guys, no need to get all scientific on me.) Besides I'll feed my car what I want to, lol.
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Old 03-10-2016, 09:04 PM   #21
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Dude, you are KILLING me... no 93 in my crap city.

Lol I never understood why some places have 93 and others don't.


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Old 03-10-2016, 09:25 PM   #22
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Lol I never understood why some places have 93 and others don't.


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In Wisconsin, it seems like the areas where they blend ethanol in, the octane is 93, but where it is not blended it is 91.


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Old 03-10-2016, 09:51 PM   #23
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I'm a "steak eater" as well. I wint even put gas with ANY ethenol in it. That crap is hard on the guts. Like eating at McDs daily. Lol
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Old 03-10-2016, 09:54 PM   #24
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I'm a "steak eater" as well. I wint even put gas with ANY ethenol in it. That crap is hard on the guts. Like eating at McDs daily. Lol

We don't have a choice around here. Thank you, EPA.


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Old 03-10-2016, 10:01 PM   #25
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We don't have a choice around here. Thank you, EPA.


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That sucks, sorry. It's hard to find in my city. Only 3 stations with zero ethenol. It's rediculous.
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Old 03-11-2016, 09:13 AM   #26
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I've used 93 octane from day one. I have to now because all my tunes are for 93. I 'think' the 2011 5.0 only has the 412 horsepower with premium fuel. My 2014 Edge with a 285 hp 3.5 says in the owners manual "for optimal performance, use premium grade fuel". Just saying......
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Old 03-11-2016, 09:25 AM   #27
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My husband and I both use premium. 92 octane is all we can find but we make sure it has no ethanol and I believe that is what helps the performance and the MPG. Premium with ethanol doesn't seem to be any different than regular. We bought Mustangs for a reason - use the premium!
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Old 03-11-2016, 11:57 AM   #28
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I use the 93 because of the 91 tune I have. We have 87,89, and 93 here. I also have a 93 tune but can't tell a performance difference between the 91 and 93 tune.
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Old 03-11-2016, 12:14 PM   #29
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just to discuss....7hp I wonder what the margin of error is on a dyno.
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Old 03-11-2016, 01:06 PM   #30
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just to discuss....7hp I wonder what the margin of error is on a dyno.
margin of error on a dyno?
Suggest using a search.
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Old 03-11-2016, 01:38 PM   #31
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I'd rather spend the time looking for my Ban Hammer.
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Old 03-11-2016, 05:45 PM   #32
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My Escape 2.0, 2014 puts out 240 Hp on premium, 231 Hp on 87. I can't tell he difference in 9HP, but I feed it premium anyway.
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Old 03-12-2016, 03:49 AM   #33
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Gas is... actually quite tricky. Octane is part of the equation. But there's also winter vs summer blend and if it has ethanol in it or if it is oxygenated. 87 winter blend with ethanol in it is common here in So Cal. And the performance hit is quite noticeable.
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Old 03-12-2016, 09:06 AM   #34
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Gas is... actually quite tricky. Octane is part of the equation. But there's also winter vs summer blend and if it has ethanol in it or if it is oxygenated. 87 winter blend with ethanol in it is common here in So Cal. And the performance hit is quite noticeable.
Try your best to stick with 91+ and no ethenol and your Pony will be on a high protein low fat diet.

Im going to try to talk my gas station that has the 91 no ethy into getting 93. They are a local owned non chain station and would be the ONLY game in town. Hell I'll build them a website and help promote it if they do. Lol
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Old 03-14-2016, 01:03 PM   #35
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My husband and I both use premium. 92 octane is all we can find but we make sure it has no ethanol and I believe that is what helps the performance and the MPG. Premium with ethanol doesn't seem to be any different than regular. We bought Mustangs for a reason - use the premium!
Ethanol does help with performance, it raises the knock threshold. Think E(thanol)85 ... It does however impact MPG. That being said, running 100% E85 requires ~40% more fuel, 50% E85 is around 20% more, 25% E85 is around 10% more fuel, and lastly, the roughly 10% ethanol most places carry would only be around 3-4% more fuel. Almost not even enough to notice

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just to discuss....7hp I wonder what the margin of error is on a dyno.
yeah, probably 2-4 if i had to shoot from the hip and guess. That being said, the computer does have the ability to add timing, to a certain degree, until it detects knock and backs off. The fact of the matter is that 93 will allow it to add timing over what it will be able to achieve on 87. Now, again, that assumes a few things:

1. That the car is in fact limited on 87 ( i dont find this too hard to believe)
2. That the computer has enough authority to raise timing to the point where switching to 93 is in and of itself beneficial.
3. The 7-8 whp we saw was above some margin of error.

Another thing to take into account ( i didnt read the article, but i am going to assume i am right on this) is that i am assuming the 7-8 whp gained are peak gains? I would take curve gains into consideration as well. Even if we say theres a 3 whp error, 4 whp over the entire power band (it may be more, it may be less) will make a car faster, whether your butt can indicate it or not.

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Try your best to stick with 91+ and no ethenol and your Pony will be on a high protein low fat diet.

Im going to try to talk my gas station that has the 91 no ethy into getting 93. They are a local owned non chain station and would be the ONLY game in town. Hell I'll build them a website and help promote it if they do. Lol
See the above, ethanol is good.
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