GAS, 89 or 91 octane?? - Mustang Evolution

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Old 03-04-2014, 01:40 AM   #1
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GAS, 89 or 91 octane??

So I've had 3 mustangs and the first few months of owning them I always said I'm gonna put nothing less than 91 octane in my tank! Then a few months goes by and I start penny pinching and I end up sticking with 89 for the rest of my owning of the car.. What's the consensus of what types of gas u should put in your 5.0 GT? I know it sounds petty but I've always wondered if there's actually proven one way or the other..

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Old 03-04-2014, 08:01 AM   #2
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89 is a blended fuel (mix of 91 and 87).
In my opinion those mixes can vary so I dont use 89. I stick with 91 or 93 in all my vehicles and power equipment.
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Old 03-04-2014, 08:24 AM   #3
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I did the exact same thing. I just did some new mods and tuned it for 93 Race. I have talked to allot of people (for what thats worth) thats says they higher octane is better for most enignes if not all and especially the new performance based engines. I love my Mustang and want it to last so I am going to use the 93 and actually buying an oil separator soon. Figure every little bit helps.
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Old 03-04-2014, 08:29 AM   #4
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The computer in the car will adjust to the low grade gas. You will loose power. But it's not the best idea to switch gas. If it were the other way around the 93 helps cleans but hey if money is tight then you have to do what you have to do.

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Old 03-04-2014, 09:17 AM   #5
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If its stock, I wouldn't use anything less then 91. If its tuned, only 93.
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Old 03-04-2014, 01:15 PM   #6
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Nothing but 93 on mine and its stock well axle backs only.
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Old 03-04-2014, 02:58 PM   #7
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Your computer will automatically adjust for the lower octane by pulling timing. So you will loose a bit of power but it's fine to run 89.
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Old 03-04-2014, 10:00 PM   #8
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It should in theory, but there are also a lot of 5.0's that are blown due to detonation. So it doesnt work 100% of the time.

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Old 03-04-2014, 11:23 PM   #9
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U can't even get 93 in Ga at regular gas stations.. lol I guess I'll switch to 91, I've only just hit the 2000mi mark..

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Old 03-05-2014, 12:06 AM   #10
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My car actually felt quicker and got better mpg with 89 and BAMA performance tune than when I put the 91 BAMA race tune with ghost cam on it.

In all reality, filling up with 89 instead of 91 only saves you about $2 going from E to F. There are other areas where you could save more than $100/year.
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Old 03-05-2014, 12:51 AM   #11
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My car actually felt quicker and got better mpg with 89 and BAMA performance tune than when I put the 91 BAMA race tune with ghost cam on it.

In all reality, filling up with 89 instead of 91 only saves you about $2 going from E to F. There are other areas where you could save more than $100/year.

That's because of the ghost cam tune. It's not originally designed for "performance"
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Old 03-05-2014, 12:56 AM   #12
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That's because of the ghost cam tune. It's not originally designed for "performance"
I thought that might be it since it's loaded up with timing. Looks like I'll have to shoot them an email for a standard race tune.
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Old 03-05-2014, 01:03 AM   #13
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I thought that might be it since it's loaded up with timing. Looks like I'll have to shoot them an email for a standard race tune.

The ghost cam design is supposed to throw off the balance of the motor to make it sound cammed. It will run pretty rich in the process also, which is why they recommend taking running off-road exhaust, so you don't clog the cats.
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Old 03-05-2014, 02:27 AM   #14
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How'd u like that ghost cam tune? That's CRAZY how just a tune will make it sound that NASTY!

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Old 03-05-2014, 02:49 AM   #15
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How'd u like that ghost cam tune? That's CRAZY how just a tune will make it sound that NASTY!

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I couldn't tell a difference honestly. I think if I had longtubes it might have been different.
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Old 03-05-2014, 03:02 AM   #16
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Really?? Dang I figured the low end would be rompin some asphalt!

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Old 03-05-2014, 04:52 AM   #17
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It could have been a number of things. I may even be wrong. I may not have ran enough tanks of 91 to get all of the 89 out. The 91 I used is notorious for having a lot of detergents in it. I plan on trying it again once I get the resonators deleted, and using the best 91 in the city. Hopefully that will change it.
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Old 03-05-2014, 08:09 AM   #18
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In NC we can get either 91 or 93 depending on the service station you visit. Personally, I only run 93 in my 11 GT. For the few cents, difference, it is not worth the lowered performance/ engine life.
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Old 03-05-2014, 09:34 AM   #19
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My Grandpa had a 05 GTO LS2 and it was supposed to be premium only. He put regular in it for 50,000 miles plus with no issues at all. Modern engines are made to pick up ping and adjust accordingly. Now if you tune it you need to meet the recruitments because it will turn that off so you get better performance. Back when my car was stock I ran 89 with no issues at all. Now that I have the ford racing tune I use BP 93 octane. I discovered that QT who only goes up to 91 was making my engine ping very slightly. In my opinion if you want good gas avoid places like QT and go to a big name brand like BP. My car sounds and runs better in daily driver situation with the BP and that could be due to the ford racing tune also.
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Old 03-05-2014, 09:46 AM   #20
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I couldn't tell a difference honestly. I think if I had longtubes it might have been different.
Just get the BBK cat deletes and you will notice a huge difference. Unless you want long tubes...
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Old 03-05-2014, 09:53 AM   #21
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Just get the BBK cat deletes and you will notice a huge difference. Unless you want long tubes...
I already have a Blow By Racing off road x-pipe....you can't get the Ghost cam tune if you have the cats.

I'll be getting Kooks LTs and off road x-pipe eventually. But that's $1500 away, lol.
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Old 03-05-2014, 10:00 AM   #22
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I already have a Blow By Racing off road x-pipe....you can't get the Ghost cam tune if you have the cats.

I'll be getting Kooks LTs and off road x-pipe eventually. But that's $1500 away, lol.

This...

BBK Mustang Off-Road Cat Delete Pipes 1674 (11-14 GT) - Free Shipping
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Old 03-05-2014, 10:06 AM   #23
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Why would I spend $150 to delete something I don't have anymore? You cannot divide by 0.

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Old 03-05-2014, 10:18 AM   #24
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Why would I spend $150 to delete something I don't have anymore? You cannot divide by 0.

Blow By Racing Mustang Off Road X-Pipe (11-14) GT 5.0L - LatemodelRestoration.com
Sorry, I was under the impression you still had cats...My buddy just put these on his car and ran the ghost cam tune...Sounds nasty!
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Old 03-05-2014, 10:21 AM   #25
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Sorry, I was under the impression you still had cats...
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Old 03-05-2014, 10:23 AM   #26
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Old 03-05-2014, 10:05 PM   #27
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I actually do want long tubes down the road.. I'm gonna start with flows outlaws or Roush axlebacks and then probably a magnaflow or bassani X-pipe with high flow cats, then some kind of long tubes.. Maybe MAC or BBK or maybe even bassani too.. But that's funny because I always try to use either BP or Chevron too cause their quality is better..

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