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WHY 91 Octane Fuel for Acura #5398772 04/09/20 08:34 PM
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David1 Offline OP
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I have a 2015 Acura ILX 2.0 and it says in owners manual 91 Octane Minimum .. Mid grade is 89 and Sunoco has 91 and 93... Sunoco is the only place that has 91 and what crazy is the 91 octane costs more then the 93 ULTRA.,,,

Anyways... Most places have 86 regular and 89 Mid-grade and 93 Premium. I tried 86 Octane when I first bought the car and it ran fine but I have been told that it will cost me in the log run...

So I have been using 93 Octane...

However the HONDA CIVIC is basically the same as the ILX.. I'm pretty sure its the same spark plugs and coils if you look up the same year and engine.. I have not done that yet but Im going to .

However the ACURA Says on the gas tank door PREMIUM FUEL ONLY... Not Recommended.... Says ONLY...

Can anyone explain why???


Thanks

P.S
Also I was told not to use Regular / 86 and then put Octane booster.... That would be bad to do with each fill up.


Last edited by David1; 04/09/20 08:35 PM.

2015 Acura ILX
60K miles
Castrol Magnatec 0w20
Re: WHY 91 Octane Fuel for Acura [Re: David1] #5398789 04/09/20 09:05 PM
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My guess is that Honda and Acura use (slightly?) different tuning/programming on these models. I know Toyota and Lexus do. Perhaps the HP/torque figures differ; this is an easy way to tell.
Also may have something to do with the fact that Acura and Honda get different target markets. Honda drivers may be stereotyped as frugal, and might balk at having to use premium gas. Acura drivers are stereotyped as more affluent, so more generally would be ok with using more expensive gas. This is likely accompanied by a tuning difference of some sort - the Acura engineers can push the envelope a bit further, perhaps...
I wouldn't fret about finding 91, I would just use whatever "Premium" is in your area. For us, there are stations with 91, 92, and some at 93. My experience on the east coast is that most stations had 93, so I'd use that and sleep well. I haven't seen 86 east of western Nebraska and/or South Dakota; are you sure that's not 87 as your regular grade rather than 86 you are seeing? That's more of a high-altitude thing, in my experience.


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Re: WHY 91 Octane Fuel for Acura [Re: David1] #5398793 04/09/20 09:10 PM
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ctechbob Online Content
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Depends on the Civic. According to what I'm seeing, the K24Z7 in your ILX was only used in the Civic SI, and according to its owners manual, it requires 91 as well. The 1.8l motors of that era called for 87.

You would probably be fine with 89. I alternate between 89/93 and ethanol free 90 on a fairly regular basis with no rhyme or reason in my TL which also calls for premium only. I might notice a small hit in mileage but I never notice any pinging or performance hit.

Try the 89, if you notice bad things, go back up to 93. The car should be smart enough to figure it out.

As for why? TmanP pretty much nailed it.


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Re: WHY 91 Octane Fuel for Acura [Re: ctechbob] #5398803 04/09/20 09:18 PM
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David1 Offline OP
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Originally Posted by ctechbob
Depends on the Civic. According to what I'm seeing, the K24Z7 in your ILX was only used in the Civic SI, and according to its owners manual, it requires 91 as well. The 1.8l motors of that era called for 87.

You would probably be fine with 89. I alternate between 89/93 and ethanol free 90 on a fairly regular basis with no rhyme or reason in my TL which also calls for premium only. I might notice a small hit in mileage but I never notice any pinging or performance hit.

Try the 89, if you notice bad things, go back up to 93. The car should be smart enough to figure it out.



Yes I forgot to mention at SHELL they have ethanol free 90 octane and actually the Acura runs best on that.... and its about the same price as the 93,. but the 93 has ethanol and Id rather not use ethanol . I have been told ethanol doesnt even burn it just goes straight through the system and its actually bad for engines...

I remember in the late 80s and 90s all gas was ethanol free and then citgo starting using ethanol and then you started to see some s gas station have signs saying 100% GAS... Now they all have it .. other then SHELL and WAWA and a few other places.

However Yes.. I really like the ethenol free 90 octane... I actually get the best fuel economy out of it.

Ill try what you said and alternate from 89 / 93 .. However Im still thinking about only using 90 E Free fuels but no all gas stations have that around here... just 2...


Last edited by David1; 04/09/20 09:27 PM.

2015 Acura ILX
60K miles
Castrol Magnatec 0w20
Re: WHY 91 Octane Fuel for Acura [Re: David1] #5398805 04/09/20 09:21 PM
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umungus1122 Offline
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They sell 86 octane in FL? Unless you really push the engine 89 should be just fine. I'm sure you can use a digital gauge to see if the engine is retarding timing at all when using it.


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Re: WHY 91 Octane Fuel for Acura [Re: TmanP] #5398810 04/09/20 09:23 PM
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David1 Offline OP
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Originally Posted by TmanP
My guess is that Honda and Acura use (slightly?) different tuning/programming on these models. I know Toyota and Lexus do. Perhaps the HP/torque figures differ; this is an easy way to tell.
Also may have something to do with the fact that Acura and Honda get different target markets. Honda drivers may be stereotyped as frugal, and might balk at having to use premium gas. Acura drivers are stereotyped as more affluent, so more generally would be ok with using more expensive gas. This is likely accompanied by a tuning difference of some sort - the Acura engineers can push the envelope a bit further, perhaps...
I wouldn't fret about finding 91, I would just use whatever "Premium" is in your area. For us, there are stations with 91, 92, and some at 93. My experience on the east coast is that most stations had 93, so I'd use that and sleep well. I haven't seen 86 east of western Nebraska and/or South Dakota; are you sure that's not 87 as your regular grade rather than 86 you are seeing? That's more of a high-altitude thing, in my experience.



Yea I think you are correct... Im sorry its 87 octane.... I dont use regular anymore so I forgot the octane... LOL.. sorry about that.

I remember the good ole days when SUNOCO had 86 Economy and 87 Regular and 90 Mid / aka PLUS and 91 Super and 94 Ultra... That was in the good ole days.

Last edited by David1; 04/09/20 09:24 PM.

2015 Acura ILX
60K miles
Castrol Magnatec 0w20
Re: WHY 91 Octane Fuel for Acura [Re: umungus1122] #5398811 04/09/20 09:25 PM
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David1 Offline OP
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Originally Posted by umungus1122
They sell 86 octane in FL? Unless you really push the engine 89 should be just fine. I'm sure you can use a digital gauge to see if the engine is retarding timing at all when using it.



Yea Im going to alternate...... 89 and 93 and when I can use the 90 E FREE...

What about useing 87 regular and adding Octane booster???

I was told thats not good to do.. What do you think?


2015 Acura ILX
60K miles
Castrol Magnatec 0w20
Re: WHY 91 Octane Fuel for Acura [Re: David1] #5398830 04/09/20 09:37 PM
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umungus1122 Offline
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Originally Posted by David1
Originally Posted by umungus1122
They sell 86 octane in FL? Unless you really push the engine 89 should be just fine. I'm sure you can use a digital gauge to see if the engine is retarding timing at all when using it.



Yea Im going to alternate...... 89 and 93 and when I can use the 90 E FREE...

What about useing 87 regular and adding Octane booster???

I was told thats not good to do.. What do you think?

No to octane booster with MMT. It will foul plugs and cats. If you wanted to increase 93 octane you could add toluene or xylene, but both cost about $15+ a gallon. Just using gas from the pump seems best for what you want to do.
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Last edited by umungus1122; 04/09/20 09:38 PM.

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Re: WHY 91 Octane Fuel for Acura [Re: David1] #5398832 04/09/20 09:39 PM
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In some locales 91 is more expensive than 93 because it has no ethanol.


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Re: WHY 91 Octane Fuel for Acura [Re: David1] #5398911 04/09/20 11:38 PM
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Originally Posted by David1


...the 93 has ethanol and Id rather not use ethanol . I have been told ethanol doesnt even burn it just goes straight through the system and its actually bad for engines...



Ethanol doesn't even burn? no-no

You should be fine with 89, 90 E0 or 93 as the owner's manual states Use of gasoline with a pump octane less than 87 can lead to engine damage.

Re: WHY 91 Octane Fuel for Acura [Re: David1] #5398922 04/10/20 12:15 AM
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oldhp Offline
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90 octane NON-ethanol would be the best. My 2019 Challenger Shaker 5.7/6 speed takes 91 octane. I put 5 gals 87 octane + 10 gals 93 octane for a mix of 91 octane. Runs great on this. I like the fact that I'm putting in 5 gals of known fresh fuel. Most stations around here only get 1500 to 3000 gals of premium once a month, sometimes a month and a half. Is the premium ok to use? Yes most probably, but I have gotten some bad 93 octane fuel. The car does not run any better on pure 93 octane either.


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Re: WHY 91 Octane Fuel for Acura [Re: David1] #5399005 04/10/20 07:01 AM
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Originally Posted by David1
I have been told ethanol doesn't even burn it just goes straight through the system and its actually bad for engines
Nonsense.
Whoever told you this was wrong.
You are overthinking this. Just use 93 Octane Premium E10 and don't worry about it.

Re: WHY 91 Octane Fuel for Acura [Re: David1] #5399409 04/10/20 02:24 PM
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To the O.P.: Could you be confusing the gas cap sticker that says to "use premium fuel only" and an owner manual that says "91 Octane recommended" to mean you can only use 91 Octane?

The "premium fuel only" sticker could be a way for Honda to get out of paying for anything under warranty if they suspect (or just feel like claiming) any drivetrain issues you might experience are caused by bad fuel. If they don't specify an Octane rating on that sticker it doesn't mean much.

Re: WHY 91 Octane Fuel for Acura [Re: David1] #5417444 04/30/20 02:56 PM
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It may be the same basic engine between the Acura and Honda, but definitely a different application. So there are some different parts, perhaps high-compression pistons or (as another said) different engine tuning or computer programming.


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