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07-27-2010, 12:17 PM | #51 |
Scooby Specialist
Member#: 194132
Join Date: Nov 2008
Location: Indiana
Vehicle:2009 WRX Sedan SSM |
subscribed. I use 93 all the time in my 09 wrx( no 91 in my area). I use all brands of gasoline and I see no difference in performance, though I do like shell, BP, and Mobil gas a little better due to their additives.
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07-27-2010, 12:22 PM | #52 |
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Member#: 192322
Join Date: Oct 2008
Location: Springfield, VT
Vehicle:2002 Impreza TS |
Asking if sunoco gas is better than mobil is like asking if polar springs water is better than voss water. Sarcasm aside Ive always run 89 in all my vehicles. Here this should help:
From Wikipedia, the free encyclopediaJump to: navigation, search A US gas station pump offering five different AKI octane ratingsThe octane rating is a measure of the resistance of petrol and other fuels to autoignition in spark-ignition internal combustion engines. The octane number of a fuel is measured in a test engine, and is defined by comparison with the mixture of 2,2,4-trimethylpentane (iso-octane) and heptane which would have the same anti-knocking capacity as the fuel under test: the percentage, by volume, of 2,2,4-trimethylpentane in that mixture is the octane number of the fuel. For example, petrol with the same knocking characteristics as a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90.[1] This does not mean that the petrol contains just iso-octane and heptane in these proportions, but that it has the same detonation resistance properties. Because some fuels are more knock-resistant than iso-octane, the definition has been extended to allow for octane numbers higher than 100. Octane rating does not relate to the energy content of the fuel (see heating value). It is only a measure of the fuel's tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner. Where octane is raised by blending in ethanol, energy content per volume is reduced. It is possible for a fuel to have a Research Octane Number (RON) greater than 100, because iso-octane is not the most knock-resistant substance available. Racing fuels, AvGas, liquefied petroleum gas (LPG), and alcohol fuels such as methanol or ethanol may have octane ratings of 110 or significantly higher - ethanol's RON is 129 (116 MON, 122 AKI). Typical "octane booster" gasoline additives include MTBE, ETBE, isooctane and toluene. Lead in the form of tetra-ethyl lead was once a common additive, but since the 1970s, its use in most of the industrialised world has been restricted, and its use is currently limited mostly to aviation gasoline. |
07-27-2010, 12:36 PM | #53 |
Scooby Specialist
Member#: 220259
Join Date: Aug 2009
Chapter/Region:
MAIC
Location: HoCo & College Park
Vehicle:09 2.5i SSM |
You must be lost, this is the NA forum. Not saying that to be an ass, but the 09 WRX requires 91, and the difference between 91 and 93 is obviously smaller than the difference between 87 and 93. The argument lies within the using 87 vs. using 93 in terms of supposed vastly improved gas mileage (42 mpg? really? ), reduced knocking, and better performance. So far, no one's shown definitive proof of ANYTHING, so until anyone proves me wrong, I'll go with what Subaru says is safe enough for my car and keep on pumping 87
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07-27-2010, 01:12 PM | #54 |
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Member#: 186654
Join Date: Aug 2008
Chapter/Region:
E. Canada
Location: Toronto
Vehicle:2005 2.5 RS Navy Blue |
My stock map logs recorded an IAM of 0.3xx (not sure of exact numbers) on 87 gas.
Does that mean my car was constantly knocking? |
07-27-2010, 01:16 PM | #55 |
Scooby Newbie
Member#: 205968
Join Date: Mar 2009
Location: New York
Vehicle:2009 |
I've done some testing with 87 VS 93 octane in a 2009 Impreza with factory tune and there was absolutely no difference. The MPGs were exactly the same when tested in exactly the same places with exactly the same speeds. However I didn't reset the ECU which I guess could make a difference.
In terms of what brand, I've noticed BP/Sunoco gas making my car seem like it was a bit more torquey after a fill up but that was probably just me/placebo effect or some other kind of variable. I usually use whatever is convenient as long as it's a well known brand and not something like "Joe's Gas Station". I don't think it really makes a difference. They all have pretty much the same ingredients and some level of detergents required by law. |
07-27-2010, 06:16 PM | #56 | ||||
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Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
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Quote:
Do you have experience tuning these cars? have you investagted how the timing advance system works and what different octane fuels will and will not allow it to do? Quote:
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Higher octane fuel, in 05-08 RS/2.5i's and probably the newer and many older model N/A impreza's will allow more timing advance to be used because on 87oct fuel only slightly more than half of the available timing advance is being used. more timing advance will allow more tq to be made, allow the engine to be more fuel efficient and reduce harmful emission output. That is a fact. This is not true for every stock vehicle, but it is for some and the stated model Impreza's is one of those. End of discussion. really. No more need to muddy this up for someone who wants to actually know how it will effect their vehicle with opinions and statements based on "I think, I heard, I felt no benefit, etc etc." |
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07-27-2010, 07:51 PM | #57 | |
Scooby Specialist
Member#: 207074
Join Date: Mar 2009
Chapter/Region:
BAIC
Location: Sacramento California
Vehicle:2015 STI You know you're jealous |
Quote:
Last edited by vrusso; 07-27-2010 at 07:59 PM. |
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07-27-2010, 09:35 PM | #58 | |
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Member#: 187595
Join Date: Aug 2008
Chapter/Region:
SCIC
Location: Fullerton, CA
Vehicle:2008 2.5i Hatch Spark Silver Metallic |
Quote:
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07-28-2010, 01:07 AM | #59 |
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Location: Calgary Alberta, Canada
Vehicle:1999 leggy gt 5speed Blood red |
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07-28-2010, 02:47 PM | #60 |
Scooby Specialist
Member#: 220259
Join Date: Aug 2009
Chapter/Region:
MAIC
Location: HoCo & College Park
Vehicle:09 2.5i SSM |
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07-28-2010, 03:41 PM | #61 | |
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BAIC
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Vehicle:2015 STI You know you're jealous |
Quote:
I believe you. I was simply stating that US Gal is not the same volume as a Canadian Gal therefore your 37mpg is different then 37mpg in the states. I was letting Bluefoton calling bs on you statement know that your numbers are fine. Canda Gal = 4.55 Litres US Gal = 3.78 Litres AKA 37mpg Canada = approx 30mpg US Last edited by vrusso; 07-28-2010 at 03:46 PM. |
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07-29-2010, 01:09 AM | #62 | |
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Vehicle:2013 WRX WRBP |
Quote:
Thank you. |
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07-29-2010, 03:49 AM | #63 |
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Member#: 102984
Join Date: Dec 2005
Chapter/Region:
MWSOC
Location: Northbrook, IL
Vehicle:2005 2.5RS 4EAT Platinum Silver |
To confirm, I haven't logged hundreds of thousands of hours like Race or Williaty, but I have logged. I can confirm less knock with higher octane.
I do log gas mileage almost always. The method is not so scientific, but to do anything more would be a strenuous task. I always drive until the light comes on and get gas as soon as possible, and fill all the way up. Then use the standard miles divided by gallons put in. That is to say, there seems to be a larger difference between 87 and 89 than 89 and 93. Not sure as to why, but the gas mileage increase seems to offset the higher price just a tiny bit more. That being said, I use 89 right now. There is no doubt that there is a difference between 89 and 93 though. |
08-10-2010, 04:46 AM | #64 | |||||
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Member#: 71092
Join Date: Sep 2004
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Location: Licking County, Ohio
Vehicle:2005 2.5RS Wagon Regal Blue Pearl |
Quote:
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This all, IMO, relates back to the fact that the EJ engines have a very un-optimized combustion chamber design and there's WAAAAAY too much piston-to-head clearance in stock form. Knock city. |
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08-12-2010, 11:25 PM | #65 |
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Join Date: Apr 2010
Chapter/Region:
NESIC
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Vehicle:o6 impreza rs silver |
I use shell gas, it gets me about 650km's on the hiway per tank, I use bronze, I find the cheaper gas stations(gulf) I'm losing about 45km's per tank... IMO it's whatever you let the ecu get used to... Yeah, that's probably not it at all, but it works for me. I've tried using premium many times and i don't notice any difference, we used to have a mini Cooper that was built to run on premium, and it really makes a difference what gas you use...... Go with what the manufacturer recommends, or spend more money on something that you might not need...
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09-26-2010, 10:21 PM | #66 |
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Vehicle:2006 Impreza 2.5i Obsidian Black |
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09-27-2010, 04:36 AM | #67 |
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Member#: 168845
Join Date: Jan 2008
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I've noticed that n/a impreza's typically burn oil at high rate while using 93, I use 89 which is mid grade, no pinging and it's still better than 87.
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09-27-2010, 05:09 AM | #68 |
Scooby Guru
Member#: 71092
Join Date: Sep 2004
Chapter/Region:
MWSOC
Location: Licking County, Ohio
Vehicle:2005 2.5RS Wagon Regal Blue Pearl |
Gasoline octane can have no impact on oil consumption.
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09-27-2010, 12:17 PM | #69 |
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E. Canada
Location: Quebec, QC
Vehicle:2022 Crosstrek Sport 6MT |
RaceFaceXC/Williaty, what's the range of timing advances allowed by the ECU (03 N/A for me)? Not sure if a ScanGauge is accurate enough to make a credible statement, but i'm definitely curious to see how far it maxes out on timing with 87 vs 91 octane...
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09-27-2010, 12:51 PM | #70 |
Scooby Specialist
Member#: 256727
Join Date: Sep 2010
Chapter/Region:
RMIC
Location: SL,UT
Vehicle:2007 2.5I Wagon Silver |
QFT
Simply put... there is knock with regular grade gasoline, and there have been many many logs to prove it. So don't be a cheap bastard... spend the extra few dollars at fill-up and get premium. Your car will run better and last longer. |
10-01-2010, 03:55 PM | #71 |
Scooby Specialist
Member#: 194132
Join Date: Nov 2008
Location: Indiana
Vehicle:2009 WRX Sedan SSM |
The kind that is combustible.
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10-01-2010, 09:02 PM | #72 |
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MAIC
Location: Pittsburgh, PA
Vehicle:2004 WRX Premium PSM |
Ditto. I think 89 is the best compromise. 93 is kinda expensive, but 89 is typically only 10 cents more than 87. Mine runs better with less pinging for sure. I don't care if it don't 'really' help... it sounds better and that makes me feel better. If it does actually help, then great! All the better
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10-02-2010, 12:36 AM | #73 |
Scooby Specialist
Member#: 102984
Join Date: Dec 2005
Chapter/Region:
MWSOC
Location: Northbrook, IL
Vehicle:2005 2.5RS 4EAT Platinum Silver |
My local road ranger sells 89 as regular and 90 as mid-grade.
SCORE! |
01-04-2011, 04:29 PM | #74 |
Scooby Newbie
Member#: 268813
Join Date: Jan 2011
Location: Grove city
Vehicle:2004 wrx sti silver |
i use sunnoco 93......id rather be safe then sorry i want me engine to run its best...the gas mileage wont get any better and dont mind spending a little more... last week i spend $3.49 for 93 but im willing to pay it...if i dont have the money i just dont put as much in...lucky i dont drive too much mostly right around my house5 or 10 miles at the most
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01-04-2011, 05:21 PM | #75 |
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Member#: 136688
Join Date: Jan 2007
Vehicle:2005 Impreza RS silver |
I agree with Williaty & RaceFace.
On my 2005 RS, the higher octane gas I pour in, the better the engine performs. And this is not a "seat of the pants" statement, it is based on logging over the last 2 months: the engine pings A LOT LESS on 94 gas than on 87 (still pings a bit at high loads/low RPMs) and runs A LOT MORE timing advance. My IAM went from 0.4 on 87 octane gas to 0.9 , even 1 lately. The car therefore uses less gas and makes a little more power. Not sure about the power since I have no dyno sheet to prove it (the car really feels more lively), but the gas mileage has definitely improved, almost enough to make the higher gas price a non issue. Williaty, thanks for suggesting a higher octane gas, it made a VERY tangible & positive difference on my 2005!!! Still need to put those regrinded cams in (they've been laying on the bench for the last month) and get the car tuned for a slightly cheaper gas (91 instead of 94). |
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