What octane do you use

[99gtp]

100+ and loving it.

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[EcoSwag1990]

93 tuned right now but for a couple weeks I was running 87 just fine

 

[GoBlues38]

93....but when I do long road trips of complete tanks with the cruise set at 70mph, I put the cheap stuff in.

 

[Melekith]

93 tuned right now but for a couple weeks I was running 87 just fine

87 on the tune?

 

[GT Nate]

In my GT I run 93, but it is not a DD.

 

[Fatty]

93 with Roush tune, not a DD.

 

[LIPony]

93

 

[Bert03GT]

93 on my DD

 

[EJS2016]

93 - not a DD.
Factory stock tune.

 

[Tcstang]

93 all the time. It's my daily and untuned.

 

[FordTechOne]

The manual says 87 octane unless you are pulling a boat. Whey 93?

Both the Ecoboost and 5.0 are rated for horsepower using 93 octane fuel. When you use 87, you reduce horsepower output and fuel economy.

On the 5.0, the PCM will pull timing to prevent detonation. On the Ecoboost, the PCM will pull both timing and boost to prevent detonation. Both of things things reduce horsepower significantly and lower engine efficiency, which means lower fuel economy.

Why would you purchase an expensive high performance car and then use crap fuel? It just makes no sense.

 

[Khyber]

every month this thread gets created again

but 93 steeda tuned.

 

[TurboMetal]

Here in Florida we have 87, 91 and 93 and I have been using 87 from day one.

Is there any truth that with 93 octane my car will feel or actually be faster?

I have a ecoboost with no mechanical power mods as of yet.

Terry

The 310 hp rating is with 93, it is rated about 270 hp on 87. So yeah I would think there would be a difference but I've been using 93 since first fill up.

Now my car is tuned for 93. My DD as well.

 

[TruBlu16GT]

Chevron 94 when I can afford it. I can easily break 400kms on a tank with mostly city driving. I can't seem to get 400kms on 91 or 87 unless I'm out on the highway.

 

[WindveilNJ]

Both the Ecoboost and 5.0 are rated for horsepower using 93 octane fuel. When you use 87, you reduce horsepower output and fuel economy.

On the 5.0, the PCM will pull timing to prevent detonation. On the Ecoboost, the PCM will pull both timing and boost to prevent detonation. Both of things things reduce horsepower significantly and lower engine efficiency, which means lower fuel economy.

Why would you purchase an expensive high performance car and then use crap fuel? It just makes no sense.

At the risk of talking about things I know little about - admittedly a long and growing list - I was merely pointing out that the manual says 87. I don't doubt it is setting an octane floor rather than ceiling and all of the hp and torque numbers in the official Mustang brochure were in fact tested with 93 octane (interestingly not the V6).

Yes it is a performance car. No, you can't legally go over 65 MPH. And even if you ignore the law (which none of us would ever do-right) there are very few places and rare times you can do it, especially here in JerZ. So why 87 octane? 30-60 cents a gallon and very unlikely to be any really meaningful performance loss. When I think I am going to be doing any truly spirited driving, I can always fill it with premium.

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