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Is there any benefit to using premium fuel? #4441499
06/25/17 09:12 PM
06/25/17 09:12 PM
Joined: Jun 2016
Posts: 30
Australia
Greatwhite7 Offline OP
Greatwhite7  Offline OP
Joined: Jun 2016
Posts: 30
Australia

Is there any benefit in your opinion to using 98/95 RON fuel over 91, or even any science to prove that premium fuel is "better"?

I have a Ford BA XR6 turbo sedan and once had to put 91 in it and noticed ZERO change.

Currently listening to a news piece on CBS and they are saying that there is no difference.

In Oz premium fuel can cost up to 20c more per litre (80c/gal).

Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441505
06/25/17 09:16 PM
06/25/17 09:16 PM
Joined: Jun 2003
Posts: 33,070
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,070
ME
Yes, but apparently not for you. Knock sensors are a real part of virtually all engine management systems now, and part of a feedback loop vs just retarding timing in an emergency.

Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441509
06/25/17 09:18 PM
06/25/17 09:18 PM
Joined: May 2013
Posts: 2,093
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,093
Saskatchewan, Canada
Yep, if the engine calls for Premium. Otherwise, no.

Most modern cars that require Premium have a computer mode that adjusts the timing via a knock sensor that will detect 87/89 and will put the engine down on power, but most users don't actually use the maximum power anyway and would not notice.


'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]
Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441510
06/25/17 09:18 PM
06/25/17 09:18 PM
Joined: Jul 2005
Posts: 30,415
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,415
NY
Only if the engine calls for it.


God Bless Our Troops

Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441517
06/25/17 09:25 PM
06/25/17 09:25 PM
Joined: Apr 2012
Posts: 5,139
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,139
MA
In the US, they typically have 93 on the east coast and 91 on the west coast. Not exactly sure why now, might just be the way it is, I think there was more demand for super on the west coast at one point. Anyway, the car I drive just calls for 91 as a minimum so I occasionally mix 1/3 regular with 2/3 super to end up a 91 mix instead of using straight 93. Don't notice any difference regardless of whether I use the mix or not. Gas mileage is about the same.

Re: Is there any benefit to using premium fuel? [Re: Johnny2Bad] #4441518
06/25/17 09:27 PM
06/25/17 09:27 PM
Joined: Jun 2016
Posts: 30
Australia
Greatwhite7 Offline OP
Greatwhite7  Offline OP
Joined: Jun 2016
Posts: 30
Australia
Originally Posted By: Johnny2Bad
Yep, if the engine calls for Premium. Otherwise, no.

Most modern cars that require Premium have a computer mode that adjusts the timing via a knock sensor that will detect 87/89 and will put the engine down on power, but most users don't actually use the maximum power anyway and would not notice.


Mine recommends 95 min.
Perhaps that is what happened to mine when I used 91, as there was no knocking or any power loss, but I was only doing 100km/h, maybe 110.

Re: Is there any benefit to using premium fuel? [Re: Wolf359] #4441520
06/25/17 09:28 PM
06/25/17 09:28 PM
Joined: Jun 2016
Posts: 30
Australia
Greatwhite7 Offline OP
Greatwhite7  Offline OP
Joined: Jun 2016
Posts: 30
Australia
Originally Posted By: Wolf359
In the US, they typically have 93 on the east coast and 91 on the west coast. Not exactly sure why now, might just be the way it is, I think there was more demand for super on the west coast at one point. Anyway, the car I drive just calls for 91 as a minimum so I occasionally mix 1/3 regular with 2/3 super to end up a 91 mix instead of using straight 93. Don't notice any difference regardless of whether I use the mix or not. Gas mileage is about the same.


Spent 2 weeks recently driving around in a 3.8l Mustang and used all diff kinds and noticed no change.
Power seemed about the same too.
Not sure if that car requires premium tho.

Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441530
06/25/17 09:45 PM
06/25/17 09:45 PM
Joined: May 2017
Posts: 127
South Texas Rancho
TexasVaquero Offline
TexasVaquero  Offline
Joined: May 2017
Posts: 127
South Texas Rancho
My car recommends 91 octane--- I have a VERSA. Who would have thought? I still use 87 octane because it can handle it and it is cheaper.


2014 NISSAN VERSA 5spd M/T- M1 EP 5w30 and M1 EP Filter. 5k OCI.
2011 CHEVY IMPALA 3.5ltrs - M1 HM 5w30 and M1 EP Filter. 3k OCI.
Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441531
06/25/17 09:45 PM
06/25/17 09:45 PM
Joined: Apr 2012
Posts: 5,139
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,139
MA
Originally Posted By: Greatwhite7
Originally Posted By: Wolf359
In the US, they typically have 93 on the east coast and 91 on the west coast. Not exactly sure why now, might just be the way it is, I think there was more demand for super on the west coast at one point. Anyway, the car I drive just calls for 91 as a minimum so I occasionally mix 1/3 regular with 2/3 super to end up a 91 mix instead of using straight 93. Don't notice any difference regardless of whether I use the mix or not. Gas mileage is about the same.


Spent 2 weeks recently driving around in a 3.8l Mustang and used all diff kinds and noticed no change.
Power seemed about the same too.
Not sure if that car requires premium tho.


Not sure about Mustang but my Mercedes does say so on the gas filler door that the minimum octane rating is 91. If the Mustang just requires regular, I wouldn't expect you to notice any difference.

Re: Is there any benefit to using premium fuel? [Re: Wolf359] #4441589
06/26/17 12:37 AM
06/26/17 12:37 AM
Joined: Feb 2008
Posts: 1,102
PA
umungus1122 Offline
umungus1122  Offline
Joined: Feb 2008
Posts: 1,102
PA
The 3.8 in the stang does NOT require premium. Won't benefit you at all.


'95 Chevy 1/2t 305 205k -NexGen Maxlife 5w-30, Wix filter
'89 Jeep Comanche 4.0 278k - GC 0w-30, Bosch LongLife filter
Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441592
06/26/17 12:52 AM
06/26/17 12:52 AM
Joined: May 2015
Posts: 235
Indonesia
nyumski Offline
nyumski  Offline
Joined: May 2015
Posts: 235
Indonesia
lol since ur case is same with me in Indonesia.

need or not,it depends on ur car. since u use RON same like me here.

for example if ur manual book says at least RON 91 and it better use 1-2 level from standard like 92 or 93.

use 98 so much waste u can count in every dollar spent..

and u just mess up with the injection timing. RON 98 is used with super high compression or high turbo boost.


14 Toyota 2.5 D4D - PTT 10w30 CL4 --> oil from Thailand
Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441632
06/26/17 03:43 AM
06/26/17 03:43 AM
Joined: Aug 2014
Posts: 1,313
Tasmania, Australia
hpb Offline
hpb  Offline
Joined: Aug 2014
Posts: 1,313
Tasmania, Australia
From the owners manual in my BF Falcon (note, BA may be different).

"All petrol vehicles can use unleaded petrol with a minimum octane rating of 91 (RON). Higher octane unleaded petrol may be used without detriment. Premium unleaded petrol with a minimum octane rating of 95 (RON) is recommended for use in XR6 Turbo and XR8 vehicles for maximum performance. These vehicles are also calibrated to run on unleaded petrol."

I take that to mean it'll run just fine on 91, especially if you're just loafing along the highway at 2,000rpm most of the time.

If it were me, I'd do 5 tanks on 91 and accurately measure the fuel consumption. Then I'd do 5 tanks on 95 and check the economy. In theory, the 95 "should" deliver better fuel economy, but if the better economy doesn't cancel out the extra cost, I'd stick with the 91. This is, of course, assuming the engine runs OK on 91, with no pinging, loss of power, poor idle, etc. Hopefully that makes sense...

Last edited by hpb; 06/26/17 03:44 AM.

MY16 Mitsubishi Outlander 2.2 diesel, 51,000km - Castrol 5w30
2006 Ford Falcon 4.0, 135,000km - Penrite Vantage 15w40, Ryco filter
Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441669
06/26/17 06:11 AM
06/26/17 06:11 AM
Joined: Mar 2013
Posts: 4,754
The Midwest
skyactiv Offline
skyactiv  Offline
Joined: Mar 2013
Posts: 4,754
The Midwest
More gas engines in vehicles in North America than not are designed to run on 87 octane.

Mazda has higher compression in the Skyactiv engine used in Europe than in North America.
Mazda supposedly told the auto press they use lower compression here due to us being addicted to 87 octane.

Europe's low octane is most places is equivalent to our 91 octane fuel. There highest octane at the pump is equivalent to what would be 96 octane here.

If 87 octane was replaced with 91 octane as the lowest octane gas at the pump here in the U.S., the auto makers would have higher compression
engines with a tad more power and fuel economy.

GM isn't gonna make a Chevy Cruze tuned for 91 octane that would otherwise break ring lands on 87 octane.
We are having a chicken or the egg thing with our junk gas.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual
Re: Is there any benefit to using premium fuel? [Re: skyactiv] #4441685
06/26/17 06:54 AM
06/26/17 06:54 AM
Joined: Aug 2010
Posts: 5,648
Champlain/Hudson Valley
Kira Offline
Kira  Offline
Joined: Aug 2010
Posts: 5,648
Champlain/Hudson Valley
When I'm pooping around town I use regular gas and rely on the knock sensors to keep things quiet. Plus I drive quite conservatively.

When I go out of town I'm in hilly, if not mountainous, regions so I throw some premium in so the engine can do any 'performing' it can with its spark advance.

I think my 2007 5 cylinder Volvo (2.435cc-20 valve-168hp) takes mid grade.

Also, there in no difference in heat content among grades of gas. Running premium in your 230 Chevy six or Chrysler Slant six gets you nothing.

Re: Is there any benefit to using premium fuel? [Re: Greatwhite7] #4441736
06/26/17 07:55 AM
06/26/17 07:55 AM
Joined: Jun 2005
Posts: 617
Danville, Indiana
IndyFan Online content
IndyFan  Online Content
Joined: Jun 2005
Posts: 617
Danville, Indiana
My Jeep will occasionally develop some knock. I used to run a couple bottles of fuel system cleaner through it and do an Italian tune-up, and that would make it subside for awhile. I then decided it was no more expensive to run a tank or two of V-Power (93 octane) through it. Two tanks of V-Power work much better. The knock disappears for about 6 or 8k miles, maybe more. I seem to notice the knock more when going from winter to summer formulated gas, too. The old 3.8 feels very noticibly better when running 93, and even when running 89.

It also runs much better on 87 octane gas that has no ethanol. Wish I had that close to home. It noticeably increases mileage and power, too. Not sure how it effects knock, since I don't run it often enough.

I used to have an 06 Solstice with a 2.4 Ecotec engine. It allowed for 87 gas but the owners manual specifically stated it would produce slighy more horsepower with 91 Octane. I could tell a small difference, and it got slightly (very slightly) better mileage with premium.

My 99 E430 says "Premium Fuel Only", meaning at least 91 octane. I run 87 in it much of the time, and feel no difference at all, with no difference in mileage. I don't worry about it, because guys on a Mercedes forum have run the 4.3 engine on nothing but 87 for hundreds of thousands of miles with no issue. Also, I've seen E class cars in parts of the world where the fuel quality would be suspect, so I doubt MB made this engine highly sensitive to fuel. Someone feel free to correct me if I'm wrong on my assumptions, but the car runs like new.

All of my other engines see no difference in performance, mileage, sound, or feel, between 87 or 93 octane.

Interestingly, I had a 93 Johnson 60hp outboard that went into limp home mode when run for awhile on 93 octane. It indicated an overheating condition, so ever since, I've steered clear of anything other than 87 in my outboards.

Last edited by IndyFan; 06/26/17 08:01 AM.

18 Jeep JLUR Wrangler 3.6 5k
15 Ford Transit 93k, Reman 3.5 @85k
08 Jeep Wrangler 3.8 123k
01 Ford F150 Crew 5.4 79k
99 Mercedes E430 Sport 89k
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