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Old 02/29/2012, 05:36 PM   #1 (permalink)
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Premium gas?

Probably a dumb question. But do the gt's take premium gas? I've been using regular but my wife's has a sticker that says premium only.... Confused


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Old 02/29/2012, 05:40 PM   #2 (permalink)
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You can use either one, but might lose a little performance with lower octane.

I'll leave the highly technical discussion about anti-knock sensors and whatnot to someone more knowledgeables
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Old 02/29/2012, 05:41 PM   #3 (permalink)
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Use premium only, just as the sticker says. The vehicle is tuned for that octane of fuel. A few more dollars a tank will net you better fuel economy and engine health in the long run.
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Old 02/29/2012, 05:44 PM   #4 (permalink)
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Thanks, I always spend the extra $ on 93 octane. I feel better now
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Old 02/29/2012, 05:49 PM   #5 (permalink)
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You can use either one, but might lose a little performance with lower octane.

I'll leave the highly technical discussion about anti-knock sensors and whatnot to someone more knowledgeables
I withdraw this comment... I believe I heard the "Car Talk" guys on the radio say something along these lines, but I would trust what Tx4Codeman says far more than that. (should have kept my e-mouth shut)
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Old 02/29/2012, 06:01 PM   #6 (permalink)
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If you open up a factory ROM and see the difference between the amount of fuel it adds for premium and non-premium cases you would be more then inspired enough to get premium.

You'd have the same result if you opened up a 6g72 after 200k miles of premium and another with 200k of 87. Actually the one with 87 probably wouldn't make it to 200k.
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Old 02/29/2012, 06:04 PM   #7 (permalink)
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A lower rating of octane fuel will be more prone to detonation. Can't be a good thing over a long period of use.
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Old 02/29/2012, 06:05 PM   #8 (permalink)
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A lower rating of octane fuel will be more prone to detonation. Can't be a good thing over a long period of use.
Does the same apply to the 4g64?
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Old 02/29/2012, 06:08 PM   #9 (permalink)
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So is it 91 or 93 octane?
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Old 02/29/2012, 06:09 PM   #10 (permalink)
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A lower rating of octane fuel will be more prone to detonation. Can't be a good thing over a long period of use.
Yup that'll cause damage in the combustion chamber
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Old 02/29/2012, 06:10 PM   #11 (permalink)
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Does the same apply to the 4g64?
Stick with the manufactures recommendation. As I said the factory Rom is tuned with that in mind. I've had more than one vehicle come to me for tuning and seen poor results from datalogs on their factory Rom. Turned out they were using regular 87. 4 cyl guys can stick with the recommended octane as their Rom isnt tuned as aggressively.
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Old 02/29/2012, 06:12 PM   #12 (permalink)
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Its rated for 91 Alex, but if you were to go all out on a build or use boost you might as well stick to 93 if you can.

The biggest problem over prolonged use that I've seen over the 30 some 6g7's I've pulled apart is the carbon build up. I've come across 200k motors that are pretty darn clean for the mileage and I've also pulled ones apart where the EGR pipe is 100% solid carbon buildup. It makes the car run like shit which in turn causes even more build up and shittier running until someone either dumps the car at the yard or develops a catastrophic problem that requires a rebuild or new motor all together.
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Old 02/29/2012, 06:17 PM   #13 (permalink)
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Use premium only, just as the sticker says. The vehicle is tuned for that octane of fuel. A few more dollars a tank will net you better fuel economy and engine health in the long run.
Think what you want but i have switched my Jeep over to premium 93 octane and even though my mileage is not much better i noticed that it runs smoother,like mentioned a few bucks a tank.
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Old 02/29/2012, 06:29 PM   #14 (permalink)
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I have been contemplating switching but I think I will what does it come out to for 14 gallons, 5 bucks? That cheaper than a subway sub
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Old 02/29/2012, 06:31 PM   #15 (permalink)
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I have been contemplating switching but I think I will what does it come out to for 14 gallons, 5 bucks? That cheaper than a subway sub
How big a difference in price is there for you guys? It's like 30 cents over here for 93 over 87. At a 100% fill up of 16 gallons that's only 4.80.
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Old 02/29/2012, 06:34 PM   #16 (permalink)
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I have been contemplating switching but I think I will what does it come out to for 14 gallons, 5 bucks? That cheaper than a subway sub
I have heard that it isn't good to run above 87 in the I4's.
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Old 02/29/2012, 06:35 PM   #17 (permalink)
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How big a difference in price is there for you guys? It's like 30 cents over here for 93 over 87. At a 100% fill up of 16 gallons that's only 4.80.
Yup same. Fuel light comes on and it only take 14.5 gal to fill. Talk about conservative
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Old 02/29/2012, 06:36 PM   #18 (permalink)
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I have heard that it isn't good to run above 87 in the I4's.
That is what's reccommended, regular which is 87
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Old 02/29/2012, 06:37 PM   #19 (permalink)
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What could be wrong with higher quality fuel..?
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Old 02/29/2012, 06:57 PM   #20 (permalink)
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Thanks, I always spend the extra $ on 93 octane. I feel better now
Lucky! I only get 91 here in AZ.
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Old 02/29/2012, 06:59 PM   #21 (permalink)
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What confuses me about this is my stratus says nothing about using premium fuel in it. (unless it does say to and I haven't seen it)

I always use mid grade when they have it, which is 89 I believe. So am I supposed to be using premium in my 3.0L too?
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Old 02/29/2012, 07:26 PM   #22 (permalink)
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Lucky! I only get 91 here in AZ.
No V-Power??

I go for Shell most of the time, sometimes Sunoco. Around here at least, their only option over 89 is 93. Some other brands, Mobil maybe, or generic actually have "91" but I rarely go to those places.
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Old 02/29/2012, 07:35 PM   #23 (permalink)
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I know our engine is tuned on 93oct but I run 87octane, no knock or any thing but then again I almost never go full throttle. And my car has 172k miles on stock engine.
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Old 02/29/2012, 07:49 PM   #24 (permalink)
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I always use premium in mine. Someone else drove it and put regular in it once, and the SES light came on, and it ran rough, so it does make a difference.
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Old 02/29/2012, 07:53 PM   #25 (permalink)
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I didn't think 91 would do anything in our I4's since they are so small, i heard you only get performance advantages if you have V8's and up? But i also heard 91 cleans your engine better than 87 or 89? I read through this thread but its mainly about the V6's...
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Old 02/29/2012, 07:56 PM   #26 (permalink)
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It's the higher compression ratio that requires the higher octane.
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Old 02/29/2012, 08:02 PM   #27 (permalink)
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What confuses me about this is my stratus says nothing about using premium fuel in it. (unless it does say to and I haven't seen it)

I always use mid grade when they have it, which is 89 I believe. So am I supposed to be using premium in my 3.0L too?

Do you have the owner's manual? Check it out, but I would think with the same engine you would have the same specs. which is 91 octane or higher, as someone mentioned earlier.
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Old 02/29/2012, 08:33 PM   #28 (permalink)
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Do you have the owner's manual? Check it out, but I would think with the same engine you would have the same specs. which is 91 octane or higher, as someone mentioned earlier.
I have looked through the owners manual in the past and didn't see anything about using premium. but my car is stored 80 miles away so I can't re-check at the moment. I'm just thinking along the same lines, it's the same motor I don't know why it wouldn't be the same specs.
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Old 02/29/2012, 08:43 PM   #29 (permalink)
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Is the "Premium Only" on the gas cap??

Its not there on my 00 GT...

Im using 93 now, but i did use 87 for 2 weeks.

Realized I can cough up another $5 for a healthier engine.

Listed in the Owners Manual maybe???
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Old 02/29/2012, 08:47 PM   #30 (permalink)
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I have looked through the owners manual in the past and didn't see anything about using premium. but my car is stored 80 miles away so I can't re-check at the moment. I'm just thinking along the same lines, it's the same motor I don't know why it wouldn't be the same specs.
it calls for 87 octane, different tune I guess.
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Old 02/29/2012, 08:51 PM   #31 (permalink)
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I had regular gas in my GT for like the first few days I got it and one morning I heard some engine knock. I switched to premium and the knock never came back. Better to be safe.
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Old 02/29/2012, 08:57 PM   #32 (permalink)
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it calls for 87 octane, different tune I guess.

Compared an 01 Stratus, 01 Eclipse, and 03 Galant v6 and all have identical Fuel & Timing maps.
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Old 02/29/2012, 08:58 PM   #33 (permalink)
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Compared an 01 Stratus, 01 Eclipse, and 03 Galant v6 and all have identical Fuel & Timing maps.
AllData shows for an 02 Strat coupe V6, 87. Same year 3G V6, 91 or better. Weird.
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Old 02/29/2012, 09:05 PM   #34 (permalink)
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EPA mileage estimates are the same too.
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Old 02/29/2012, 09:17 PM   #35 (permalink)
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Would not be the first time I've caught AllData being dead fucking wrong.
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*rolls into lift while talking to passenger* Oh I'm sorry, I can't hear you over the sound of HOW AWESOME MY ENGINE IS.
2000 Celica GTS 'slowest gts evar'
1998 Mazda 626 FS-DE/CD4E 'mom-mobile'
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Old 02/29/2012, 10:16 PM   #36 (permalink)
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Atleast I don't feel like a stupid girl questioning this now.

I could swear that I didn't find anything in the owners manual about using a higher octane. there is also nothing on the gas cap or door, but that doesn't really mean anything.
I also didn't have any knocks or pings or odd engine noises when I did use 87. My car is also fairly low mileage yet, if that makes any difference.

Edit... I looked up the specs on edmunds.com and it lists regular unleaded for both the 3.0 and the 2.4 in the stratus coupes, but I have no idea how reliable that information is.
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Old 03/01/2012, 02:00 PM   #37 (permalink)
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When I bought my 3g I didnt know if it needed premium. I have a 2000GT but I figured it would but had no real proof. My friends 98 SVT Cobra Mustang as "Premium Only" on the fuel gauge and on the speedo right in your face. So I had a buddy look it up and he said that it was supposed to use 91 octane, but that the cars computer could detect if you were using lesser octane gas and compensate for that. Not sure how true that is. Now I run 89 octane because no stations near me run 91 but should I start using the 93 as soon as possible??
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Old 03/01/2012, 02:10 PM   #38 (permalink)
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So I had a buddy look it up and he said that it was supposed to use 91 octane, but that the cars computer could detect if you were using lesser octane gas and compensate for that. Not sure how true that is.
Our ECU's contain two sets of maps for both fuel and timing, being a Low Octane and High Octane Fuel & Timing maps. The ECU will reference the Low Octane maps under high counts of knock or with the lower octane fuel. These maps are more "Retarded" and "Rich" to help the engine run safer, while sacrificing performance.
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Old 03/01/2012, 03:16 PM   #39 (permalink)
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If you're running an 00 you really should be running premium. The high octane map is way more aggressive in both timing and fueling then any other year. When I went logging with my 72 knock was very common, I had 2 counts sporadically at WOT pretty much every pull and that was using 91. The older GT's have whimpier maps and are more forgiving in terms of blowing the motor up but performance will suffer in either case.
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Old 03/01/2012, 04:15 PM   #40 (permalink)
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There are a few nuggets of truth in here and a whole lot of crap. I'm surprised that the stratus 3.0 doesn't call for 91 or higher. If I had one, I'd definitely be putting premium in it. Other than that, everyone should use the factory recommended fuel for their engine.

The I4 guys should use 87, and the V6 guys 91 or higher. It's really that simple.
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Old 03/01/2012, 05:04 PM   #41 (permalink)
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Quote:
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There are a few nuggets of truth in here and a whole lot of crap. I'm surprised that the stratus 3.0 doesn't call for 91 or higher. If I had one, I'd definitely be putting premium in it. Other than that, everyone should use the factory recommended fuel for their engine.

The I4 guys should use 87, and the V6 guys 91 or higher. It's really that simple.
Would it be bad for an I4 to use 91? Or is it just a wast of money?
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Old 03/01/2012, 05:52 PM   #42 (permalink)
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Originally Posted by 04blueEclipse View Post
Would it be bad for an I4 to use 91? Or is it just a wast of money?
It's mainly just a waste, though the engine isn't factory-tuned for the higher octane. People have the wrong idea that it somehow gives their car magic unicorn fart pixie dust extra power. It's just slower burning to prevent detonation in a higher compression engine (the V6 is higher compression than the I4). Why would you need that in the I4?
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