Premium Gas - Subaru WRX Forum
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post #1 of 17 Old 10-15-2004, 03:02 AM Thread Starter
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Premium Gas

I live in California home of the highest gas prices in the nation. I know this may sound like a dumb question but here goes... HOW IMPORTANT IS IT TO MY '05 WRX WAGON TO CONTINUALLY FILL UP WITH PREMIUM (91 octane) GAS? What happens if I put in a lower grade gas? Will there be any engine damage? PLEASE HELP ME!!!

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post #2 of 17 Old 10-15-2004, 08:45 AM
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You would be wise to continue to use the crap Premium they sell out there. Search for more info on this but here are some reasons:

1. You are voiding the warranty by not using the recommended fuel or better.

2. They have that recommendation for a reason! You use lower grade like 89 or 87 you WILL get knock. It's not a question of if but when.

3. Yes if you are stock or moding and use lower grade gas you could potentially blow up something.

4. You just paid ~$25K for one of the best performance compact cars out there. Why shortchange yourself and scrimp on the gas?

It is an unfortunate thing out there in Cali but you only have your wonderful tree-hugger CARB to thank for it.
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post #3 of 17 Old 10-15-2004, 09:29 AM
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premium gas...

my older crappier cars get better mileage on premium so would it stand to reason that a WRX which is tuned for 91-93 octane gas would get better mileage on 91 than on 87...

Just an example, my wife's taurus wagon gets 25 mpg on premium
it gets 20 mpg on regular (this is on my daily commute tested with 2 tanks of each)
sooo... if premium were $2.50 and regular were $2.01 it would be CHEAPER to buy premium. CHEAPER per mile without regards to knock or any other engine wear.
Course I am in texas and premium is 93 octane, so it will not be as dramatic in Cali.

It will prevent knock (which WILL kill your engine).


Can a stock mustang GT beat you if you are running 87 and he is running 91?? probably
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post #4 of 17 Old 10-15-2004, 02:22 PM
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The best thing for you to do is stick to the fuel that the engine requires. The octain is higher for a reason. If you run on 87 or even 89 for that matter, your car will run like a piece of sh!t. It won't be fun. Then things will start going wrong. It'll start with sluggish behavior, then knocking, then you'll start having to tune your car too often because you'll be eating up spark plugs. I know it's expensive, but you just gotta deal for now.

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Originally Posted by Rain_Racer
Can a stock mustang GT beat you if you are running 87 and he is running 91?? probably
More than likely and that would, be a big dissapointment for WRX drivers everywhere.
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post #5 of 17 Old 10-15-2004, 10:14 PM
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I'm confused as to why we are even discussing this? If it says 93, use 93. Hell, go to Sunoco and get 94 ... if you love your modded rex.

"I hear Buschur Racing does WRX UTECs now ... oh buddy!"
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post #6 of 17 Old 10-16-2004, 01:25 AM Thread Starter
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I guess that was a stupid question!

thanks for the unanimous voice to keep the premium. I wish they had higher grade in CA too, but only if its as cheap as it is elsewhere in the country.

Hodori
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post #7 of 17 Old 10-17-2004, 01:20 AM
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*sigh*, that is quite a draw-back. You may want to read up on water injection. I read a tech article in Turbo Performance Mag. today about it and using it to up horsepower, lower intake charge, and (this is for you) raise the detonation threshold. They never spoke of being able to run a lower octane with H2O injection on board, but if you can't, I'd like to know why not.

"I hear Buschur Racing does WRX UTECs now ... oh buddy!"
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post #8 of 17 Old 10-21-2004, 07:14 PM
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it's kinda like a person buying an SUV asking about gas mileage...(if you have to ask, you shouldn't buy it)

that being said. i usually run Sunoco 94 unless i can't find a station while on the road.
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post #9 of 17 Old 10-21-2004, 11:32 PM
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Quote:
Originally Posted by Quack
it's kinda like a person buying an SUV asking about gas mileage...(if you have to ask, you shouldn't buy it)

that being said. i usually run Sunoco 94 unless i can't find a station while on the road.
Does the Sunoco where you are have alcohol in it? All Sunoco does here so I won't buy it. Damn corn gas.
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post #10 of 17 Old 10-22-2004, 09:06 AM
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Quote:
Originally Posted by jwtarbaj
You would be wise to continue to use the crap Premium they sell out there. Search for more info on this but here are some reasons:

1. You are voiding the warranty by not using the recommended fuel or better.

2. They have that recommendation for a reason! You use lower grade like 89 or 87 you WILL get knock. It's not a question of if but when.

3. Yes if you are stock or moding and use lower grade gas you could potentially blow up something.

4. You just paid ~$25K for one of the best performance compact cars out there. Why shortchange yourself and scrimp on the gas?

It is an unfortunate thing out there in Cali but you only have your wonderful tree-hugger CARB to thank for it.
While I agree with #2-4, #1 is wrong. Legally, unless they supply the fuel for you, they cannot void your warranty by running other fuel. Same thing with oil, coolant, transmission fluid, etc...
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post #11 of 17 Old 10-22-2004, 10:34 AM
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Quote:
Originally Posted by Cosmo
While I agree with #2-4, #1 is wrong. Legally, unless they supply the fuel for you, they cannot void your warranty by running other fuel. Same thing with oil, coolant, transmission fluid, etc...
While I agree it SHOULD be wrong I must disagree and side with reality. There is a label on the gas cap/door and the dealer when you buy is very firm and clear about using Premium unless you are without any other choice.

If they are going to void you for having a cat-back they will certainly be willing to void you for using low-octane grade fuel. On the same page if they tell you to use 5W-30 or 10W30 and you use 15W-50 which is not in the acceptable range then they can void you for it. You have to use what meets their requirements.
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post #12 of 17 Old 10-22-2004, 10:43 AM
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The legally can't void your warranty for that. Ford got into trouble for that recently. Unless they are supplying something free of charge, legally you do not have to use it to maintain your warranty.
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post #13 of 17 Old 12-19-2004, 09:24 PM
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Quote:
Originally Posted by Hodori
I guess that was a stupid question!

thanks for the unanimous voice to keep the premium. I wish they had higher grade in CA too, but only if its as cheap as it is elsewhere in the country.

Hodori
Here's a little experiment:
Next time's your tank's low, give yourself a Christmas present and spring for a couple of gallons of 100-110 octane gas, then tell us what you think.
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post #14 of 17 Old 01-03-2005, 01:08 PM
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110 octane would be leaded gas, which would be really bad for the car. i belive that the highest un-leaded gas that exists is 100, or maybe a 104. the way i understand race gas is that it is the lead that raises the octane content.
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post #15 of 17 Old 01-03-2005, 01:20 PM
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Elf used to make 116 octane unleaded gas. I don't know if they still do or not. About 10 years ago it was like $7.50 a gallon....
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