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Old 03-26-2003, 12:16 AM   #1
Sothoth
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Default What gas to use in your STi?

In quite possibly the dullest thread ever, I was just wondering what everyone uses for their gas?

I personally use Chevron Supreme (92). I don't switch from this brand, as I assume the performance of my WRX will hold steady. Or is this an urban myth?

Does anyone use another brand that they prefer? Is there a 93 octane readily available or higher? What are STi owners going to be feeding their beasts?

Does anyone care?

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Old 03-26-2003, 01:46 AM   #2
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It's a turbo charged high performance car.... use the best
premium gas u can find...

for CA people like myself... we could only do 91 at best..
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Old 03-26-2003, 02:02 AM   #3
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Quote:
Originally posted by JT-KGY
It's a turbo charged high performance car.... use the best
premium gas u can find...

for CA people like myself... we could only do 91 at best..
But aren't those ratings the guaranteed minimum? Presumably some brands of gas may have an octane rating that's higher than others..

Of course, I may just be talking out my ass..
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Old 03-26-2003, 03:30 AM   #4
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91 octane is typically the highest octane gas you can find in California. Only at select pumps which are pretty rare (Maybe in big cities and at the racetracks) 87, 89, and 91 are the only octanes available. Not only do we have the most expensive gas in the country but also the worst octane rating. But we do have some nice mountain roads.

If there were any higher octane gas available, believe me, I would be filling up the scoob with it and cranking up the boost

~Evan
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Old 03-26-2003, 07:20 AM   #5
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I'll be going with Sunoco 94 octane.
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Old 03-26-2003, 09:15 AM   #6
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And your car will make 300 BHP on Sunoco 94.

Someone needs to dyno an STi on 94 and 91 and see what the power loss is.
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Old 03-26-2003, 10:19 AM   #7
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Default

Agreed- (G. Wallace) It would be interesting to see the difference between the two octanes.

Of course there is the debate on which company fuel is better? (chevron, Texaco, 76, Sunoco etc...) I really don't know if there is a non-biased site that has data on better fuels.

Last summer, people (incl friends and relatives) were having fuel pumps going bad on their cars here in the southern Ohio area. It was blamed on bad fuel at the refinnery in Kentucky. The deal was that you pay for the fuel pump to be replaced and the refinnery will send you a check, which they did after about 6 weeks.

Of interesting note was that the blame was not going on the local BP, chevron, marathon gas stations, but on the refinnery itself. The answer to this was that all the gas produced for our cars in this region comes from the same KY refinnery and that there is bascially no difference between fuels. (BTW, we do not have a Suncco station here in this area)

I was a little shocked to hear that there is little difference at all between brands of fuel. I usually get my gas from the same station each week due to its high quality (they change their filters often, of which you can see) and good price. In the past, I've always thought that gas station "X" had better quality gas than gas station "XX".

Anybody want to shed some light on gas quality? Has anyone heard about the same gas used by different gas stations?

Davis
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Old 03-26-2003, 10:25 AM   #8
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I recently saw on TV or read somthing about the oil refining process. yes it is true that a number of different companies use the same refinery, but once they have the gas it's the additives they add to it after refining that make up the differences in brands.
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Old 03-26-2003, 10:49 AM   #9
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I talked to someone who worked at a refinery and he said all gas is the same.

the different brand's trucks all pulled up to the same pump.

do you think those trucks insert additives on the way to the gas station? or unload, insert additives and reload and then go to the gas station?

I seriously doubt it.
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Old 03-26-2003, 11:00 AM   #10
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Quote:
Originally posted by Glenn Wallace
And your car will make 300 BHP on Sunoco 94.

Someone needs to dyno an STi on 94 and 91 and see what the power loss is.
I would guess we wouldn't see much loss due to the higher displacement of the STi over something like the Evolution. A standard WRX is ~113 HP/liter. The STi is 120HP/liter if the numbers Subaru has given are true.
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Old 03-26-2003, 12:47 PM   #11
STi INGER
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Quote:
Originally posted by rally_wannabe
I talked to someone who worked at a refinery and he said all gas is the same.

the different brand's trucks all pulled up to the same pump.

do you think those trucks insert additives on the way to the gas station? or unload, insert additives and reload and then go to the gas station?

I seriously doubt it.
I have heard that gas stations add stuff to the gas at the station itself, not the tanker truck.
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Old 03-26-2003, 01:44 PM   #12
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Default

Quote:
Originally posted by STi INGER


I have heard that gas stations add stuff to the gas at the station itself, not the tanker truck.
And I've heard that the tanker actually does the additive. However, I would like to know for sure. Hopefully there is someone "here" that can give us the low down.

Davis
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Old 03-26-2003, 02:32 PM   #13
somebody else
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Add a couple gallons of 100 octane to a tank of California piss (91 octane) and good things happen. There are a couple stations close by my house that sell 100 octane unleaded at the pump @ $4.00 or more / gallon. The Union 76 site has mixing charts that show the effective octane from mixing 91 and 100 together.

This works on the WRX and I bet it works on the STi too.

--scott
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Old 03-26-2003, 03:07 PM   #14
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Just some "seat-of-the-pants" input... The WRX seems to get better mileage running on Sunoco Ultra and may even run cooler. Another important tip is to never pump gas into the car if there is a tanker truck filling the station; it stirs up all kinds of dirt from the bottom of the tank.
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Old 03-26-2003, 06:25 PM   #15
spburns74
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93 oct or higher is always available in NH. I too try to stick with one gas brand. I find I use Mobile, but that may also be because I use Mobile 1 synthetic motor oil in my Superhawk (special motorcyle oil) and my last 2 Imprezas. I haven't run into having any bad tanks of gas like I have from those corner store gas stations. Keeping mobile going strong.
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Old 03-26-2003, 06:26 PM   #16
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.

Last edited by spburns74; 03-26-2003 at 09:01 PM.
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Old 03-26-2003, 06:26 PM   #17
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Last edited by spburns74; 03-26-2003 at 09:01 PM.
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Old 03-27-2003, 03:42 PM   #18
banghado
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Would running 88 or 89 Octane do any damage to the car? If I am just puttering around downtown or stuck on the interstate doing 72MPH in a straight line for 9 hours, I'd probably rather not blow the big bucks on the expensive gas.......
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Old 03-27-2003, 03:46 PM   #19
JT-KGY
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Quote:
Originally posted by banghado
Would running 88 or 89 Octane do any damage to the car? If I am just puttering around downtown or stuck on the interstate doing 72MPH in a straight line for 9 hours, I'd probably rather not blow the big bucks on the expensive gas.......

dont get this... why dont you save even more money and get the
2.5RS??? since using 88 or 89... you'll probably get that same
amount of hp...
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Old 03-27-2003, 06:37 PM   #20
spburns74
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Are you trying to encourage detination????????? What are you going to save, $2.00 per fill up by putting in that junk (88-89 oct). If you need to save that much money, than why.....never mind. Silly question anyways.
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Old 03-27-2003, 08:13 PM   #21
somebody else
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Hey! Why even bother with pricey 87 octane?

Just piss into the tank; you'll do just fine.

- - -

When the ECU senses detonation it takes more or less drastic measures to prevent the engine from blowing up. The three biggest measures are richening up the fuel/air mixture, turning down the turbo boost, and retarding the ignition timing. These actions work to (a) decrease your mileage and (b) decrease your performance. When it's all said and done, the money you saved on fuel prices will be eaten up in reduced gas mileage. I would call that "breaking even" except -- remember -- you gave up a ton of performance.

--scott
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Old 03-28-2003, 12:32 AM   #22
Chuck Annicelli
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I mix all my own gas by hand. I use 33% sunoco 94 then 33% 87 octane then 33% Tap water. and 1% Dry gas. The dry gas is to help get rid of some of the water. The water saves you a ton on gas money. Generally the car will not start so I burn almost no gas.

Haha,

Not pointing fingers at anyone.

Cheers,

Chuck
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Old 03-28-2003, 12:34 AM   #23
Chuck Annicelli
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I mix all my own gas by hand. I use 33% sunoco 94 then 33% 87 octane then 33% Tap water. and 1% Dry gas. The dry gas is to help get rid of some of the water. The water saves you a ton on gas money. Generally the car will not start so I burn almost no gas.

Haha,

Not pointing fingers at anyone.

Cheers,

Chuck
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Old 03-28-2003, 12:34 AM   #24
Chuck Annicelli
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I mix all my own gas by hand. I use 33% sunoco 94 then 33% 87 octane then 33% Tap water. and 1% Dry gas. The dry gas is to help get rid of some of the water. The water saves you a ton on gas money. Generally the car will not start so I burn almost no gas.

Haha,

Not pointing fingers at anyone.

Cheers,

Chuck
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Old 03-28-2003, 08:09 AM   #25
banghado
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Thanks for the responses. I did not know that using lower octane gas could damage an engine or decrease mileage enough to offset the cost savings from the cheaper gas. This board is very informative.....
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