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Old 08-11-2011, 08:54 PM   #1
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Default 89 Octane gas

Does anyone or any vehicle use this grade of gasoline? Pretty much most of the vehicles i've driven or rode in usually either use 87 or 91-3 depending on location.

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Old 08-11-2011, 08:55 PM   #2
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Default Re: 89 Octane gas

waste of money.

unless your vehicle states that it REQUIRES something other than 87, you're throwing your money away
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Old 08-11-2011, 08:56 PM   #3
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Default Re: 89 Octane gas

I think 89 is designed for cars with compression ratios of about 9.0 to 10 ish. Not entirely sure.

+1 for solbros, If your car's compression ratio isn't above 10 ish or below 13, 91 will reduce fuel efficiency.
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Old 08-11-2011, 08:57 PM   #4
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Default Re: 89 Octane gas

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I think 89 is designed for cars with compression ratios of about 9.0 to 10 ish. Not entirely sure.

+1 for solbros
my brother's del sol vtec REQUIRES premium 91 fuel, but it has god's engine (b16)
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Old 08-11-2011, 09:00 PM   #5
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Default Re: 89 Octane gas

My car produces 486rwhp on E85.
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Old 08-11-2011, 09:04 PM   #6
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Default Re: 89 Octane gas

Never used it in anything, either 87 if I am filling up a lawnmower or 93. My brother uses it and claims his truck runs better, has better performance and gas mileage. I kinda just roll my eyes, it is 2 points higher than regular, I can't imagine it working that much better. Since I was 15 years old I have had to put premium in all the motor vehicles I have owned. The vehicle with the lowest compression was 9.1:1 and then I advanced the timing 6 degrees more than stock, so yeah it needed premium. Then the next was 10.5:1, then 11.1:1... can you tell I haven't owned something boosted? lol
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Old 08-11-2011, 09:05 PM   #7
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Default Re: 89 Octane gas

your brother doesn't know what he is talking about. total placebo doe
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Old 08-11-2011, 09:06 PM   #8
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Default Re: 89 Octane gas

You have to increase the octane as you increase boost, just like compression.
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Old 08-11-2011, 09:07 PM   #9
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Default Re: 89 Octane gas

Not sure what it's good for.
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Old 08-11-2011, 09:09 PM   #10
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Default Re: 89 Octane gas

my accord only calls for 86, hahaha

89's a ripoff btw, you could mix 87 and 93 to get 90 octane for the same price, buts that is even more stupid than 89
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Old 08-11-2011, 09:11 PM   #11
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Default Re: 89 Octane gas

You can mix 93 Octane with Xylene/Toulene from the paint store and a little Marvel Mystery oil to get 100 octane.
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Old 08-11-2011, 09:12 PM   #12
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Default Re: 89 Octane gas

Toulene, yum
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Old 08-11-2011, 09:21 PM   #13
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Default Re: 89 Octane gas

I've never understood why 89 octane gas existed either. Cars in the U.S. seem to be designed to either be able to run on regular, which is 87 octane, or premium, which is 91 and up.

I'm sure there is a reason so I'd honestly like to know. Does anyone know of a car out there that actually asks for 89 (or "Plus" gas as I think it is called) instead of regular?
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Old 08-11-2011, 09:26 PM   #14
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Default Re: 89 Octane gas

My Stihl trimmer and riding lawnmower both call for 89 octane.
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Old 08-11-2011, 09:27 PM   #15
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Default Re: 89 Octane gas

I run noithing but 87 in my car. No point to run anything else.
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Old 08-11-2011, 09:30 PM   #16
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Default Re: 89 Octane gas

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My Stihl trimmer and riding lawnmower both call for 89 octane.
I need something more substantial than that. I'd have a hard time believing an entirely different grade pump exists just for people filling up certain types of lawn equipment haha. I demand you search the internets and get back to us.
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Old 08-11-2011, 09:31 PM   #17
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Default Re: 89 Octane gas

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My Stihl trimmer and riding lawnmower both call for 89 octane.
i used to use shell vpower 93 from the mower and trimmers


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Old 08-11-2011, 09:33 PM   #18
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Default Re: 89 Octane gas

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I need something more substantial than that. I'd have a hard time believing an entirely different grade pump exists just for people filling up certain types of lawn equipment haha. I demand you search the internets and get back to us.
i think it's because it takes near zero effort to create. they literally combine the 91 and 87 to make it. there is not a separate tank for 89
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Old 08-11-2011, 09:50 PM   #19
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Default Re: 89 Octane gas

i have ran 89 the past few weeks. with the crazy heat this summer while running 87 my car ran really sluggish. i was reading 89 can help the motor run stonger in high heat. i have used 89 before in more avg temps with no change but it does help in 100 plus degree temp.
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Old 08-11-2011, 10:00 PM   #20
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Default Re: 89 Octane gas

I Run premimmmm in mys2000000000.



premimmmmmmmmmmmm orbujst.
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Old 08-11-2011, 10:07 PM   #21
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Default Re: 89 Octane gas

89 is like Synthetic blend oil of gas.

You will get something, but not extreme.
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Old 08-11-2011, 11:02 PM   #22
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Default Re: 89 Octane gas

I run 89 octane, it's fine for me. I'm at a higher altitude though (currently in Grand Junction, CO), so because of the reduced air density we have 85 octane available here as regular grade unleaded. 89 at this altitude would be like 91 at sea level, although we still have 91 available if people choose.
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Old 08-11-2011, 11:50 PM   #23
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Default Re: 89 Octane gas

So do all cars just run shittier when you're at that altitude? I remember going just even over the passes out here loss of power is hugely noticeable
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Old 08-11-2011, 11:52 PM   #24
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Default Re: 89 Octane gas

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i think it's because it takes near zero effort to create. they literally combine the 91 and 87 to make it. there is not a separate tank for 89
Learned something new today....I think, though I feel like I might have known that a long time ago and simply forgot. I'll grant you credit for the time being.
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Old 08-12-2011, 12:02 AM   #25
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Default Re: 89 Octane gas

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i have ran 89 the past few weeks. with the crazy heat this summer while running 87 my car ran really sluggish. i was reading 89 can help the motor run stonger in high heat. i have used 89 before in more avg temps with no change but it does help in 100 plus degree temp.
Hotter intake air temps increases the chance of detonation, all things being equal, so depending on how your ECU responds that potentially makes sense. Running at the lowest octane at such temps might cause the ECU to pull a lot of timing or run the car richer than usual in order to keep knock in check. Running a little higher octane = less knock potential so the ECU can feed back in some timing/lean the motor back out to more like normal.
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