Noob Octane question

[ero 5.0]

So nobody offers 93/94 octane fuel in my town, but there is a 76 station that has 100 octane. So my question is: Is it the same as filling 15 gallons of 93 is I were to fill say 10 gallons of 91 and then 4 or 5 gallons of 100? Or does it not work like that to mix diff octanes? Thanks.

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[ero 5.0]

i hear that stuff is not good for ur engine...

 

[Gdyup50]

Our engine actually suggests just using 87, there really isn't any use for spending the extra money for 100....if you really want to use 91 go ahead...coming from an M3 that required 91, I'm glad I don't have to pay the extra for premium gas anymore...

 

[markology]

Our engine actually suggests just using 87, there really isn't any use for spending the extra money for 100....if you really want to use 91 go ahead...coming from an M3 that required 91, I'm glad I don't have to pay the extra for premium gas anymore...

Do you mean the suggested octane for the gt is 87?

 

[Gdyup50]

Yes it is.....trust me I was shocked. page 127
http://www.fordservicecontent.com/F...-Owners-Manual-version-1_om_EN-US_07_2014.pdf

Do you mean the suggested octane for the gt is 87?

 

[markology]

Yes it is.....trust me I was shocked. page 127
http://www.fordservicecontent.com/F...-Owners-Manual-version-1_om_EN-US_07_2014.pdf

yeah, that is shocking. So why is it that when we use higher octane, the car gets more power? Is it because this is a "performance" engine? I know reports have always said that using higher octane offers no performance benefits.

https://www.consumer.ftc.gov/articles/0210-paying-premium-high-octane-gasoline

Confused. :shrug:

 

[rio16]

So nobody offers 93/94 octane fuel in my town, but there is a 76 station that has 100 octane. So my question is: Is it the same as filling 15 gallons of 93 is I were to fill say 10 gallons of 91 and then 4 or 5 gallons of 100? Or does it not work like that to mix diff octanes? Thanks.

lol..not a noob question at all.. the same w me.. around where we live theres that 100 octane in the southside.. i think this is a question we have to ask our tuner lol.. i heard theres a 93 gas in redwood city but thats too far for me..

 

[Gdyup50]

I'm not an octane wiz, but I'm pretty sure all engines work better on higher octane fuel, has something to do with the way the fuel burns or something. I'm guessing our engines are setup to work at optimal performance on lesser octane. I'm sure using higher octane wouldn't hurt anything, I just doubt that the difference would be worth paying the extra. I realize 89 or 91 is only .10 or .20 difference, but 'm pretty sure the 100 octane is close to if not more than $5 a gallon....like I said my M3 required 91 or higher, if I did happen to use 87 or 89, the engine would ping....

yeah, that is shocking. So why is it that when we use higher octane, the car gets more power? Is it because this is a "performance" engine? I know reports have always said that using higher octane offers no performance benefits.

https://www.consumer.ftc.gov/articles/0210-paying-premium-high-octane-gasoline

Confused. :shrug:

 

[Firepath]

I'm not an octane wiz, but I'm pretty sure all engines work better on higher octane fuel

Noooope. An engine will run most efficiently / make peak power using the lowest octane that does not detonate.

EDIT: If your car has the smarts to pull timing to limit detonation it will likely run better on higher octane stuff. Most of the cars already in existence are not like this though. Most (if not all) of the cars to come in the future will be like this.

 

[SVTFreak]

Noooope. An engine will run most efficiently / make peak power using the lowest octane that does not detonate.

EDIT: If your car has the smarts to pull timing to limit detonation it will likely run better on higher octane stuff. Most of the cars already in existence are not like this though. Most (if not all) of the cars to come in the future will be like this.

This is absolutely right.

Octane is actually a fuels resistance to burning. The higher the octane, the LESS it wants to burn (or ignite, more specifically). Most people don't understand this.

Most cars, timing is set and doesn't move. Use the lowest octane it will run. Usually manufacturers recommendation unless tuned. Which means higher octane is less power if timing doesn't change.

However, the mustang adds timing until knock is sensed. More octane yields more timing which yields more power. So higher octane means more power and more efficiency.

 

[Gdyup50]

OK cool, like I said I'm no wiz....so having said what you did, if the GT suggests 87, is that what should be run, or will 89 or 91 give it a measurable power increase?

This is absolutely right.

Octane is actually a fuels resistance to burning. The higher the octane, the LESS it wants to burn (or ignite, more specifically). Most people don't understand this.

Most cars, timing is set and doesn't move. Use the lowest octane it will run. Usually manufacturers recommendation unless tuned. Which means higher octane is less power if timing doesn't change.

However, the mustang adds timing until knock is sensed. More octane yields more timing which yields more power. So higher octane means more power and more efficiency.

 

[10splaya22]

OK cool, like I said I'm no wiz....so having said what you did, if the GT suggests 87, is that what should be run, or will 89 or 91 give it a measurable power increase?

Not really unless you can measure a couple hp which you can't. Its different if you have boltons and are tuned specifically for a higher octance. Then it will make a difference.

 

[Gdyup50]

OK that's what I thought, most of the tunes are set for 93 or above thought right? Highest we have that is readily available here in SoCal is 91...

Not really unless you can measure a couple hp which you can't. Its different if you have boltons and are tuned specifically for a higher octance. Then it will make a difference.

 

[Free Agent]

93 is recommended for all 435 HP. Higher octane will prevent knock and not force your car to pull timing.

93 > 91 > 87

Do what you want to do but know 93 offers you more "protection" and more power in the 5.0

 

[Gdyup50]

As I posted earlier, the manual suggests 87 for the GT...I realize that the higher octane the better the fuel.

93 is recommended for all 435 HP. Higher octane will prevent knock and not force your car to pull timing.

93 > 91 > 87

Do what you want to do but know 93 offers you more "protection" and more power in the 5.0

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