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View Poll Results: Please specify which Octane rating
Chevron 72 80.00%
Shell 11 12.22%
Petro Can 10 11.11%
Mohawk/Husky 6 6.67%
Esso 1 1.11%
CostCo 1 1.11%
SuperSave 1 1.11%
SuperStore 1 1.11%
Multiple Choice Poll. Voters: 90. You may not vote on this poll

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Old 03-12-2009, 06:52 PM   #1
Drakar
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Subaru Stars What Gas do you use?

So it's not another mileage question (but that is always useful) and it's more directed at the FI guys (sorry N/A folks) but what brand of Gas and what octane rating.

I have always been a firm believer of Chevron 94 Octane as being the best, but Ive been reading alot and of course filtering out the fact that Americans are blessed with 100 at the pump

So does different brands mean different power on stock/stg2/dyno tuned cars

Im sure higher octane means better performance, but Ive also heard that with most gases showing 10% ethanol or more it requires MORE fuel to make the same level of AFR the ECU wants to see and so you burn more gas = worse mileage.

So let me know what you guys have experience, I plan to log a few more runs on the current setup with 94 Chev and then hopefully log some runs on 91 Shell v-power and see if there is a difference (the map I have is 91oct with more boost so well see, there is no timing changes)
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Old 03-12-2009, 07:15 PM   #2
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Higher Octane also means it needs to be at a higher temperature to ignite,
Doesn't always mean more power
You still need to be burning an affective octane level for your set up

But Chevron 94 FTW !
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Old 03-12-2009, 07:19 PM   #3
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well more and more I read says that 100% gas is better for mileage and potentially power, since it has a higher BTU rating then the higher octane rating of a ethanol blended gas.

one example is that Stoich (not good for us but still a good example and best for NA) is ~14.6 now this is with 100% Gasoline, with 10% ethanol in the mix, your AFR's should be ~14.1 so you need MORE gas to make the same power levels and keep the O2's and ECU happy which results in worse mileage (but maybe not power).

If some of the tuners don't post here ill see about contacting directly to see if they have tuned cars running different gases, we all know race gas is nice but tuned for what pump gas would be interesting.
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Old 03-12-2009, 07:25 PM   #4
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Well, I'm a firm convert from Chevron 94 to Petro Can 94 - I've experimented a number of times with different and won't go back to Chevron due to the poor mileage (loss of 100kms per tank) and boost response I get with (which I attribute to the computer retarding the timing due to detonation - more advance equals faster boost and less gas pedal travel needed to get the car moving).
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Old 03-12-2009, 07:29 PM   #5
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yeah i want to see more response i had my sti for 2 months now and been using only chevron 94, not to happy with the mileage but i expected it lol but if theres something better i will try it
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Old 03-12-2009, 07:33 PM   #6
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According to wikipedia there's only a shell and chevron refinery here in BC. AFAIK the oil companies do quite a bit of swapping back and forth due to inventory issues so for all you know 94 Petro Can is the same as 94 Chevron.
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Old 03-12-2009, 07:40 PM   #7
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Quote:
Originally Posted by Yannerd View Post
According to wikipedia there's only a shell and chevron refinery here in BC. AFAIK the oil companies do quite a bit of swapping back and forth due to inventory issues so for all you know 94 Petro Can is the same as 94 Chevron.
ah from what I have read, ALL gas is the same, the difference is in additives and blending.

91 Octane Gas is what it is, but Chevron adds Techron and Shell adds their **** and so on, then you get something like.

So exampl is 91 Octane Shell is what it is plus the cleaners, but its straight 91 octane (check label at the pump if it doesn say it contains ethanol then your getting the straight goods)

if you go to Chev and put in 94, it says it contains ethanol (like mohawk) ethanol is 116 octane, but isn't as good as gas but when mixed still gives you more octane rating hence the 94 rating vs 91 or 92. But it has less BTU's and you can read about the AFR's in my previous post, which is why Im interested in figuring out if there is a better gas to be running and we don't know or if we are just the target of marketing and are blindly putting in the highest octane vs the best gas.
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Old 03-12-2009, 07:47 PM   #8
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Quote:
Originally Posted by Drakar View Post
ah from what I have read, ALL gas is the same, the difference is in additives and blending.

91 Octane Gas is what it is, but Chevron adds Techron and Shell adds their **** and so on, then you get something like.

So exampl is 91 Octane Shell is what it is plus the cleaners, but its straight 91 octane (check label at the pump if it doesn say it contains ethanol then your getting the straight goods)

if you go to Chev and put in 94, it says it contains ethanol (like mohawk) ethanol is 116 octane, but isn't as good as gas but when mixed still gives you more octane rating hence the 94 rating vs 91 or 92. But it has less BTU's and you can read about the AFR's in my previous post, which is why Im interested in figuring out if there is a better gas to be running and we don't know or if we are just the target of marketing and are blindly putting in the highest octane vs the best gas.
I actually meant that you aren't 100% positive chevron gas contains techron because of all the swapping back and forth. Or that shell gas contains cleaners.

As for the better choice, I understand you should put what you're tuned for or what the manual says if you're not tuned. There's no point in putting 94 in a 2.5i since all you're doing is probably not igniting the gas and spitting it out the back end. On that note, you can still put 87 in say a factory WRX but the computer just senses the knock and pulls timing accordingly. You also have to remember the whole (R+M)/2 thing since that adds a whole new dimension to the discussion of octane. Oh and from what I've been told by a guy who heard from another guy, Chevron gas is indeed better than Husky gas and apparently you can see it when you're tuning the car.
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Old 03-12-2009, 08:15 PM   #9
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^ Yan this is what im trying to find proof on, and ya the friend of a friend while tuning found that 1 fuel is better then another I think we need to know.

Again ill see about calling some of the tuners and see, but it's tough if everyone runs 94 Chev and they are tuned for it how can someone compare to say another brand if everyone "believes" that 94 chev is the best.

If proven it's the best then great its what I normally run.

But ya the R+M/2 is also why Octane ratings here and in somewhere like Japan (only place I know for sure that markets and shows it different) are different by alot, but calculated they are close.

argh wish I could just pump whatever, but eh gotta know whats best.
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Old 03-12-2009, 08:17 PM   #10
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OMG...Chevron 94...not other choices !
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Old 03-12-2009, 08:48 PM   #11
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chevron 94 !

i get scared when i have to drive to seattle because i cant fill up!
but incase anyone is wondering if you can make it back in one tank of gas -YES
i drove to seattle, southcenter mall and some malls on the way back in 1 tank!
drove a total of 650 or so highway kms on my almost stage 2 wrx
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Old 03-12-2009, 09:24 PM   #12
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I'm, tuned for 94, sooo ya..
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Old 03-12-2009, 09:59 PM   #13
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A buddy and I were contemplating gas prices in the interior and we noticed that there were never any fuel trucks on the Coquihala, so we did some research...

Gasoline(and Diesel too, it turns out) is piped into BC's interior via one major pipeline from alberta. All the stations use the same pipe. Basically, the Chevron (or shell, or petrocan...) truck driver lines up in the queue, fills his truck from a common tank, adds his additives for octane, detergents (techron) and it all mixes while he makes his rounds...

It's probably a similar arrangement in many other places?

Oh, and I run Shell because they give air miles...

Last edited by timbits; 03-12-2009 at 10:04 PM.
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Old 03-12-2009, 10:14 PM   #14
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That's the thing, everybody runs Chevron 94 because everybody says Chevron 94 is the best.

Nobody actually knows, they just do it because everyone else does it.

I suggest trying Petro Can 94, drive your car normally for a 100km or so (give it time to remap) and then take it for a good boot and see what you think.

Also record how many km you get out of a tank.

You're not going to hurt anything and you may just learn something - there's nothing to lose.
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Old 03-12-2009, 10:20 PM   #15
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Chevron 92 (91 if I can get it in the interior).

Yan, they swap stock, but usually before it is blended.

There is (was) a refinery in Prince George. Husky Energy
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Old 03-12-2009, 10:32 PM   #16
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chevron 94 - although petro can 94 is good too!
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Old 03-12-2009, 10:36 PM   #17
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Quote:
Originally Posted by timbits View Post
Oh, and I run Shell because they give air miles...
I will never use Shell again I was running it my Olds about 6-8 years ago went they had the recall. I had to drop the exhaust, drop the tank, get a new feul pump, fuel filter, injectors, flush lines etc a lot of work and $$$ later I was up and running again.

Quote:
Originally Posted by rockcrete View Post
That's the thing, everybody runs Chevron 94 because everybody says Chevron 94 is the best.

Nobody actually knows, they just do it because everyone else does it.

I suggest trying Petro Can 94, drive your car normally for a 100km or so (give it time to remap) and then take it for a good boot and see what you think.

Also record how many km you get out of a tank.

You're not going to hurt anything and you may just learn something - there's nothing to lose.
So if your wrong that on my RR tuned car that running Petro Can and it cause's my engine to pop you're newbie status is going to buy me a new engine?

I think I'll trust Pat judgement to use the Chervon 94 in my car, only!
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Old 03-12-2009, 10:37 PM   #18
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Chevron 94
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Old 03-12-2009, 10:52 PM   #19
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I don't think your engine is going to explode if you put petro 94 in if it's what's available...there's a reason your car has a knock sensor if there is a significant difference in the makeup of the gas. That being said, it makes the most sense to run what your car was tuned on. Anything else introduces unknown variables into the mix...what's the point? There's a chevron on every street corner.

One of the reasons why the OEM ecu maps are so tame is to accommodate for people doing horrible things to their cars. When you remove those margins, you have to take a bit more care then the average joe.

If you still have the stock maps...well, don't worry about it too much.
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Old 03-12-2009, 10:55 PM   #20
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Quote:
Originally Posted by Loomin View Post
although petro can 94 is good too!
petro can 94 cost me a new fuel pump on my used S4... ... no go...
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Old 03-12-2009, 11:01 PM   #21
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Quote:
Originally Posted by dasnowman View Post
I will never use Shell again I was running it my Olds about 6-8 years ago went they had the recall. I had to drop the exhaust, drop the tank, get a new feul pump, fuel filter, injectors, flush lines etc a lot of work and $$$ later I was up and running again.



So if your wrong that on my RR tuned car that running Petro Can and it cause's my engine to pop you're newbie status is going to buy me a new engine?

I think I'll trust Pat judgement to use the Chervon 94 in my car, only!
I'd be extremely surprised if Pat had tuned your car so close to the ragged edge that one tank of a different brand 94 octane would blow it.

Just because I'm a newbie on a Subaru forum doesn't mean I don't know anything about cars (and turbos).
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Old 03-12-2009, 11:06 PM   #22
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Quote:
Originally Posted by Linkseal View Post
petro can 94 cost me a new fuel pump on my used S4... ... no go...
how?

my car lost its fuel pump the day after I bought it and it ran chevron, same with my 92 wagon, pump started to die and it only saw 94 as well, now if like dasnowman said you have to replace the fuel system then thats a valid claim.

So in regards ti tuning on 94 is that what rocket rally recommends or is it just the common fuel used and of course continuing to use the same is recommended.
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Old 03-12-2009, 11:13 PM   #23
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chevron 94, got it tune for 94 so i don't drive to the states LOL
it's better to rent a car like Toyota yaris or camry then driving the suby coz gas will last longer and cheaper to fill with 87 LOL
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Old 03-12-2009, 11:14 PM   #24
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Quote:
Originally Posted by Linkseal View Post
petro can 94 cost me a new fuel pump on my used S4... ... no go...
My guess is you asked for warranty and their response was "what brand of gas did you put in the car?"

Can't say I've replaced any fuel pumps except to upgrade them....... the only vehicle I've ever had to replace one on was an Explorer back in my Chevron days.......
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Old 03-12-2009, 11:29 PM   #25
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^ I had a sad personal story...

I used Chev 94 for S4 always... One day, I had to get the Petro Can 94 (I was travelling to Maple Ridge on hwy 7)... after filling 20 liters, started the car, 1st, fuel gauge still showed close to empty, 2nd, car ran just wierd (I can tell the difference for sure), felt like it was not really responding, checked oil and water temp, normal...

2 days later, car was going even slower than normal...went to dealership for a check, fuel pump was done, that mechanic said sth like fuel pump burnt or sth, ...the fuel was sticky, fuel pump can't suck it up to cool down...sth like that...so I replaced the fuel pump, got some chev 94 back in tank, ...believe or not Fuel gauge just went back to normal (I had no idea why?)

Since then, I stick with chev 94, on my 2 used cars and current car...not a poblem at all...
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