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Old 03-12-2013, 07:03 AM   #1
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Which gas?

When looking three weeks ago at the Ford dealership I noticed that on the 2013's it said recommended 89 octane (minimum 87). Looking at a spec sheet inside the 2014's it said that required on the GT is 89 octane and the minimum is 89.

Can anyone shed some light on this? Is there really any difference between the 13 and 14 in this area? What should I be putting in my tank? Is 87 okay? Can I fill up with 87 then the next 89 or what?
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Old 03-12-2013, 07:14 AM   #2
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When looking three weeks ago at the Ford dealership I noticed that on the 2013's it said recommended 89 octane (minimum 87). Looking at a spec sheet inside the 2014's it said that required on the GT is 89 octane and the minimum is 89.

Can anyone shed some light on this? Is there really any difference between the 13 and 14 in this area? What should I be putting in my tank? Is 87 okay? Can I fill up with 87 then the next 89 or what?
Why not just always put in 89 for ease of mind? Ford recommends 89, so use it.
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Old 03-12-2013, 07:22 AM   #3
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ALWAYS use the recommended gas. The people who say they want to save money are just crazy.

Cheaper grade gas burns worse and will offset and money saving in small MPG losses.

Higher grade gas burns better and will usually offset the extra money spent.

Which brings me to my point. The difference in a full tank between 87 and 93 is like 4 dollars. If you can afford a 5.0 you can afford it's gas more than likely.
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Old 03-12-2013, 07:49 AM   #4
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The owner manuals recommend 91. So I don't understand why the spec sheets say 89 haha
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Old 03-12-2013, 08:15 AM   #5
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The owner manuals recommend 91. So I don't understand why the spec sheets say 89 haha
I thought so. It was probably just a "dealer" spec sheet added in to try to highlight certain things. It didn't look too official.
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Old 03-12-2013, 08:30 AM   #6
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I run only 93 nothin but the best for her. U have a engine with a lot of horsepower she needs premium gas lol
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Old 03-12-2013, 09:17 AM   #7
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Old 03-12-2013, 10:03 AM   #8
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I run only 93 nothin but the best for her. U have a engine with a lot of horsepower she needs premium gas lol
Premium could also be considered 91, apparently. Sunoco for instance labels 91 as premium, and the manual states that 91 is premium. So I don't know that you actually have to run 93, although I sometimes do.
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Old 03-12-2013, 11:04 AM   #9
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Premium could also be considered 91, apparently. Sunoco for instance labels 91 as premium, and the manual states that 91 is premium. So I don't know that you actually have to run 93, although I sometimes do.
Nah, 91 or higher is premium. Some places sell multiple grades over 91, but 91 is considered premium anywhere. If you are able to tune for higher octane than more power can be had, but stick with premium always in your coyote. The high compression ratio requires premium.

Yeah yeah yeah, I know these cars can adjust timing to "use" 87, but really your car is retarding the timing and therefore is not running at peak efficiency.
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Old 03-12-2013, 11:08 AM   #10
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Nah, 91 or higher is premium. Some places sell multiple grades over 91, but 91 is considered premium anywhere. If you are able to tune for higher octane than more power can be had, but stick with premium always in your coyote. The high compression ratio requires premium.

Yeah yeah yeah, I know these cars can adjust timing to "use" 87, but really your car is retarding the timing and therefore is not running at peak efficiency.
Correct a car corrects and retards timing as needed but it isn't meant to be permanent. If you can't afford the gas, you can't afford the car.
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Old 03-12-2013, 11:25 AM   #11
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Nah, 91 or higher is premium. Some places sell multiple grades over 91, but 91 is considered premium anywhere. If you are able to tune for higher octane than more power can be had, but stick with premium always in your coyote. The high compression ratio requires premium.

Yeah yeah yeah, I know these cars can adjust timing to "use" 87, but really your car is retarding the timing and therefore is not running at peak efficiency.
True, you cannot find 93 octane in California, so our "premium" is 91
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Old 03-12-2013, 12:22 PM   #12
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Nah, 91 or higher is premium. Some places sell multiple grades over 91, but 91 is considered premium anywhere. If you are able to tune for higher octane than more power can be had, but stick with premium always in your coyote. The high compression ratio requires premium.

Yeah yeah yeah, I know these cars can adjust timing to "use" 87, but really your car is retarding the timing and therefore is not running at peak efficiency.
So since I'm on the stock tune I would want to run 91. Correct? According to Ford, that is.
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Old 03-12-2013, 12:29 PM   #13
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So since I'm on the stock tune I would want to run 91. Correct? According to Ford, that is.
91 or higher yea
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Old 03-12-2013, 01:30 PM   #14
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I always put premium in mine. I ran a tank of 87 and mileage was a little worse. I'd recommend you stick to 89 or 91+ octane.
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Old 03-12-2013, 01:54 PM   #15
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93 all the way
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Old 03-12-2013, 01:58 PM   #16
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93 hands downs, my body shop accidentally put 87 and man could I tell the difference. No punch or get up and go, then I put her back on the natural diet and she flying again
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Old 03-12-2013, 02:37 PM   #17
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93 all the way
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Old 03-12-2013, 03:41 PM   #18
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I can't remember the last time I hit less than the 93 octane button at Shell
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Old 03-12-2013, 05:48 PM   #19
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Premium could also be considered 91, apparently. Sunoco for instance labels 91 as premium, and the manual states that 91 is premium. So I don't know that you actually have to run 93, although I sometimes do.
U are absoultly right in michigan u can fill up with 97
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Old 03-12-2013, 05:56 PM   #20
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if you cant afford the gas for the car then you prolly should look at something else.
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Old 03-12-2013, 05:58 PM   #21
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if you cant afford the gas for the car then you prolly should look at something else.
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Old 03-12-2013, 06:19 PM   #22
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if you cant afford the gas for the car then you prolly should look at something else.
I don't think anyone who buys these to pay for 87 over 93, it's just if the engine runs best on 89 there's no reason to run 93. If Ford recommends 91 the stock tune probably runs best on 91. There was a discussion in a previous thread that higher octane doesn't mean better unless it's what the engine/tune requires.
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Old 03-12-2013, 06:26 PM   #23
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These threads are pointless... If u wanna use piss in your tank go right ahead, it's your car... It's a performance car, if u have issues getting the better gas then u have the wrong car smh
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Old 03-12-2013, 06:32 PM   #24
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Being a new Mustang owner I naturally assumed I would use the highest octane gas I could find. That happens to be 91 in my neck of the woods.
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Old 03-12-2013, 06:55 PM   #25
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Chevron Canada is 94 octane so i use the best.......94 octane.
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Old 03-12-2013, 07:40 PM   #26
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Old 03-12-2013, 10:41 PM   #27
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I can't remember the last time I hit less than the 93 octane button at Shell
everywhere around me sells 93 but ONE shell gas station in KY. I pulled up and went to get gas and saw the 92 button instead of 93 and . I run a 93 tune so I decided to drive down the street to a different shell and get gas.
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Old 03-13-2013, 09:25 PM   #28
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I don't think anyone who buys these to pay for 87 over 93, it's just if the engine runs best on 89 there's no reason to run 93. If Ford recommends 91 the stock tune probably runs best on 91. There was a discussion in a previous thread that higher octane doesn't mean better unless it's what the engine/tune requires.
This.

It amazes me how a lot of people think higher octane gas is always best for their car (engine). The recommended octane rating by the manufacturer is what the stock tune is at. The only way to gain better performance from a higher than recommended fuel octane rating is if you are tune for it.
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Old 03-14-2013, 01:15 PM   #29
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This.

It amazes me how a lot of people think higher octane gas is always best for their car (engine). The recommended octane rating by the manufacturer is what the stock tune is at. The only way to gain better performance from a higher than recommended fuel octane rating is if you are tune for it.
Not true if u run 87 your car it will b slower I know for a fact. and if any body ever use 87 and switched to 93 its a big difference
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Old 03-14-2013, 01:29 PM   #30
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This.

It amazes me how a lot of people think higher octane gas is always best for their car (engine). The recommended octane rating by the manufacturer is what the stock tune is at. The only way to gain better performance from a higher than recommended fuel octane rating is if you are tune for it.
This is not completely true, if you have a car recommended burning 87 octane, theoretically there should be no problems with the timing etc on that vehicle, but being a lower grade fuel you also get higher amounts of sediment and deposits, most companies put additives in to keep that down, but even on an 87 tuned car, they should run the highest octane fuel every now and then to clean out any carbon deposits on the injectors and valves. This is because the higher octane has a more resistance to burning and tends to burn hotter as the compression increases.
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Old 03-14-2013, 01:42 PM   #31
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This is not completely true, if you have a car recommended burning 87 octane, theoretically there should be no problems with the timing etc on that vehicle, but being a lower grade fuel you also get higher amounts of sediment and deposits, most companies put additives in to keep that down, but even on an 87 tuned car, they should run the highest octane fuel every now and then to clean out any carbon deposits on the injectors and valves. This is because the higher octane has a more resistance to burning and tends to burn hotter as the compression increases.
Higher octane fuel burns at the same temperature. It does not burn any hotter.

The only difference in higher octane fuel is it's resistance to detonation under compression. Other than that, there is no difference.

You should run the octane that is recommended for your car, period. Running anything higher will not result in any benefit.

If you don't believe me, google it.
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Old 03-14-2013, 07:45 PM   #32
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Higher octane fuel burns at the same temperature. It does not burn any hotter.

The only difference in higher octane fuel is it's resistance to detonation under compression. Other than that, there is no difference.

You should run the octane that is recommended for your car, period. Running anything higher will not result in any benefit.

If you don't believe me, google it.
This is where you and I will greatly disagree, outside of google, meaning in an actual engineering text book, higher octane fuels burn hotter due to the extra compression within the cylinder before ignition due to the resistance of ignition.

They also benefit from burning cleaner than lower octane fuels as I said before this resulting in less deposits formed on the injector tips and valves!

Don't believe everything you read on the Internet!
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Old 03-14-2013, 08:23 PM   #33
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Maverick is correct on this. Higher octane fuels burn hotter for the reasons listed but also that it takes more energy to burn than lower octane fuels. Longer chain hydrocarbons (hc's) hold more energy and require more energy to release the energy and will burn hotter
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Old 03-14-2013, 08:30 PM   #34
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Maverick is correct on this. Higher octane fuels burn hotter for the reasons listed but also that it takes more energy to burn than lower octane fuels. Longer chain hydrocarbons (hc's) hold more energy and require more energy to release the energy and will burn hotter
I thought we had cleared this up on another thread! If there is one thing in this world that I know for sure it's fuel, especially since I deal with it everyday! Lol
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Old 03-14-2013, 08:58 PM   #35
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All the charts that I see say that the higher the octane, the lower the BTU/gallon. Also, due to the fact that they burn slower, the latent heat of vaporization is lower as well.

I will give you this, the differences between 87 and 93 are so negligible it probably does not make a difference but, when you get up into 100+ octane gas, it burns considerably colder.
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