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Old 04-21-2002, 01:11 AM   #1
ShamgarSonofAnath
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Default What kind of gas do you put in your Subaru?

I'm almost ready for my 2nd tank. 312 miles so far on the first one of premium.
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Old 04-21-2002, 02:57 AM   #2
jasona
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ive been running 87 or 89 octane (whatever the cheapest the gas station had) for the last 26,000 miles but i just put a nitrous kit in so now its 93.
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Old 04-21-2002, 12:51 PM   #3
z wrx
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93 always.
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Old 04-21-2002, 12:58 PM   #4
corbeil
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We get Sunoco 94, and I take delivery of my black wrx sedan this wednesday. STI suspension,OZ 18's,SO3's. Can't wait
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Old 04-21-2002, 03:29 PM   #5
blarg
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well I was a big proponent of "gas is gas" because I know a guy who used to work for Arco and he told me about the whole process...the only real difference is the stuff they add to it....not the gas itself. mostly it depends on what your car likes. I've recently discovered that my WRX gets about 30-40 miles more on a tank of Chevron/Texaco that it does on a tank of Exxon/Mobil...and it runs a lot smoother too...all depends on how they get to their particular octane numbers and what they add to lower gasoline's resistence to burning (lower octane gas burns easier than high octane), and what you car likes. It also depends on what part of the world you live in because gas regulations chance from place to place (and of course don't forget elevation). My example is only applicable to SOuthern California for example....but I'd like to hear if anyone else noticed this difference between Mobil and Chevron.....kinda makes me sad though because I do like my Speedpass
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Old 04-21-2002, 04:29 PM   #6
KAuss
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blarg: I always thought that HIGHER octane gas burnt faster than LOWER octane gas.... I thought cleaner gas has an easier time burning... Maybe someone can clarify this for me...

And another thing is that Texaco is really Shell gas now and in a few months they'll change all those signs into Shell logo. I USED to use shell gas until people started moving toward Chevron. I personally don't notice any difference in driving when using Shell or Chevron, but I haven't fully broken in the car yet and haven't played around with full boost or WOT.

I've been putting nothing but 91 octane (WRX required) in my car and it's been my only "fun drive" limiting factor so far. Shell and Chevron have some weird prices in San Francisco... I can find the cheapest Shell gas and it'll be cheaper than the cheapest Chevron. But in retrospec, the most expensive gas in the city is ALSO Shell gas.. Go figure...

I'm gonna use Chevron now since I've been using nothing but shell gas on my old car. All my friends advised me to use Chevron and I see it's prolly a good time to change.

Ka Man
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Old 04-22-2002, 03:33 AM   #7
HondaH8er
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From http://www.howstuffworks.com/question90.htm :
Quote:
The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.
In the 2.5RS, the 87 octane is what it was designed to use, and I seem to get the best performance/milage out of it. If you want to waste your money, you can use a higher octane fuel, but it's harder for the engine to ignite, so it could cause a slight loss in power, and probably no gains.
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Old 04-22-2002, 03:43 AM   #8
BrotherOfGoo
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91 on my rex
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Old 04-22-2002, 05:03 AM   #9
ShamgarSonofAnath
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Thanks HondaH8er. I was planning on never buying an ICEE from a gas station again to make up for the difference in gas price and now I don't have to.
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Old 04-22-2002, 12:26 PM   #10
krave
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93 octane, prefer exxon
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Old 04-22-2002, 12:35 PM   #11
Impreza Rider
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93 daily, 93 + octane booster on race days
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Old 04-22-2002, 04:21 PM   #12
Wrex Power
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Sunoco 94, only because there are four sunocos near me.
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Old 04-22-2002, 04:58 PM   #13
GM02WRX
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If you look in your owner's manual, the recommended octane for the WRX is 91. Anything more is a waste(provided you have made no advances in timing). The octane rating is simply a measure of the fuel's ability to withstand detonation. You WILL NOT gain any power or have a "cleaner" burn with a higher octane fuel. All you are doing is dumping your $$. If you use 91 and your car does not detonate(i.e. knock/ping), then there is absolutely no reason to get "race" fuel for the track (unless, like I said: you are advancing your timing or causing some other type of detonation-prone situation through tuning). Hope this clears things up!
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Old 04-22-2002, 05:18 PM   #14
footypaul
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I always buy 93 or whatever is available. I know the manual says 91, but the next step down is usually 89, so i stick to premium.
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Old 04-22-2002, 06:05 PM   #15
ShamgarSonofAnath
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I just filled up with 87 after 320 miles on 13.5 gallons of premium. I noticed right away that taking off slowly from stoplights and stop signs that I didn't have to push quite as hard and it was a tad bit smoother. I guess this could be from the easier ignition of the gas. It could have also been caused by a better idle which would be because of the gas. I consider myself pretty sensitive to these things but could be totally wrong.
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Old 04-22-2002, 08:00 PM   #16
mad-dog999
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Quote:
Originally posted by GM02WRX
If you look in your owner's manual, the recommended octane for the WRX is 91. Anything more is a waste(provided you have made no advances in timing). The octane rating is simply a measure of the fuel's ability to withstand detonation. You WILL NOT gain any power or have a "cleaner" burn with a higher octane fuel. All you are doing is dumping your $$. If you use 91 and your car does not detonate(i.e. knock/ping), then there is absolutely no reason to get "race" fuel for the track (unless, like I said: you are advancing your timing or causing some other type of detonation-prone situation through tuning). Hope this clears things up!
Heh.. unless you live in New England, where the gas goes from 89 to 93. We don't have 91 around here. You can get 94 as well.

And actually, you do benefit by running higher octane at the track. It's called safety margin. You shouldn't have problems with 91, but if you're doing repeated laps at WOT, heat *will* build up very quckly, and could potentally lead to detonation. It's a good idea to have a nice safety margin, even if it costs a little more. A few gallons of 94 or some booster are cheaper than a new set of heads or pistons.

-John
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Old 04-22-2002, 08:05 PM   #17
Stanley
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I burn 76 in my car. It's the only gas in California without MTBE. I'm forced to run 91 octane, the highest grade sold around here.
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Old 04-22-2002, 08:25 PM   #18
naveeny
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87 octane, Costco.

Does anyone know what distributor they buy from. Its got to be from one of the big ones.

I also realized that put the tire pressure to 34 on all the tire gave me more gas mileage and better suspension performance.

Last edited by naveeny; 04-22-2002 at 08:34 PM.
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Old 04-22-2002, 09:32 PM   #19
blarg
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the manual also says that you have to use 91 octane to get the performance quoted in the ads. It won't kill your car to run lower octane gas. By law all cars have to be able to run on all grades of gas without damage, but its TUNED for 91-92 if you're looking to get max performance.
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Old 04-23-2002, 12:06 AM   #20
ShamgarSonofAnath
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<--- I drive a 2.5RS Blarg....
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Old 04-23-2002, 01:52 AM   #21
ScoobyBoy
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i feed my baby 91.
our car's have class, sadly.
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Old 04-23-2002, 03:06 AM   #22
HondaH8er
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Quote:
Originally posted by blarg
the manual also says that you have to use 91 octane to get the performance quoted in the ads. It won't kill your car to run lower octane gas. By law all cars have to be able to run on all grades of gas without damage, but its TUNED for 91-92 if you're looking to get max performance.
But running a lower octane , especially in a FI engine, will have a much greater chance of pinging/knocking, both of which can damage an engine. Basically, if you haven't done any mods that nessecitate a higher octane fuel, just use what the manufacturer tells you too. Gas is spendy enough with out throwing 93 octane fuel in a NA RS that only needs 87.
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Old 04-23-2002, 04:14 AM   #23
jhonas
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87 or 89 octane and then 91 (or whatever premium is) every 3000 miles or so... Don't ask me why, I don't know why I do.
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