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Camaro V6 LLT Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 10-16-2011, 08:41 PM   #1
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Regular or Premium Fuel?

I have a 2012 Camaro 2LT/RS with the LFX engine.
I know these V6 engines run on regular unleaded, but if I am willing to spend a bit more and give my car 91 octane premium fuel, would that make the car a bit more powerful? Could the LFX engine handle higher octane fuel?
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Old 10-16-2011, 08:59 PM   #2
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There are several threads that address this with the LLT.....I'm not sure how it would pertain to the LFX but I see no reason why you couldn't. I always put 93 oct when possible and the camaro seemed to run smoother and I would get better mpg. Of course in Cali you are stuck with 91 so I would just use that. Maybe try several full tanks of 91 and then compare your mpg with both?
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Old 10-16-2011, 09:36 PM   #3
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The higher the better

I've now tried both, and the higher is very noticeable!
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Old 10-16-2011, 09:56 PM   #4
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Well, we really don't know as much about the Delphi ECM in the LFX versus the Bosch in the LLT, but if it works the same (advancing timing until spark is detected) then I would think running premium fuel would have a similar affect.

Some guys say they notice a small increase in performance, some just say the car seems to run smoother, and some say they can't tell any difference whatsoever.

One thing we do know, is that with the LLT running premium fuel will keep the computer from pulling as much timing as it does on regular.
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Old 10-16-2011, 10:14 PM   #5
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I just picked up my 2012 2LT on Monday - had a full tank with Regular from the dealership. It sounded a little knocky - if you read the manual it says you may get spark knock if the octane is too low. I filled it up with 93 at about 180 miles. I'm up to 300 miles now and the engine definately sounds and feels smoother. Some of that may just be engine break in, but I'm sold on 93.

Feels a little more responsive as well, especially at lower RPM - pulled a u-turn today (legal in NC) punched it a little and it broke sideways real easy. Lots of fun!!

Can't wait to gets some mods on it. Vararam says they are working on an intake for LFX.
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Old 10-17-2011, 10:38 PM   #6
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i've always used regular but now after reading some threads, im gonna bump it up to either 89 or 91
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Old 10-20-2011, 01:13 PM   #7
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before i went e85, I ran 93 all the time. You get noticeable performance over reg and I got better mpg with 93 so price just about equaled out!
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Old 10-20-2011, 01:29 PM   #8
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If your delphi's kr thresh hold is programmed anything like our LLT then I would use the highest octane I can find at all times. I can't stand the way my LLT always show knock. That will be the first thing I will take care of once I get a chance to get my hands on HP tuners if it happens like it suppose to.
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Old 10-20-2011, 01:34 PM   #9
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When i ran 87 my tips were clean, when i ran 89 they got blacker but didnt really see no difference.. im gonig to try 91, but idk i heard its just a waste.? i guess different opinions lol
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Old 10-20-2011, 01:40 PM   #10
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Quote:
Originally Posted by booth8233 View Post
When i ran 87 my tips were clean, when i ran 89 they got blacker but didnt really see no difference.. im gonig to try 91, but idk i heard its just a waste.? i guess different opinions lol
Not a waste at all. Its a fact. Our ecm will pull timing like crazy with 87 but will do so less with higher the octane giving you a better optimal consistent timing
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Old 10-20-2011, 02:18 PM   #11
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well guess its just he said she said.. i actually did worse mpg with 89 then 87.. ill give 91 a try and see how that works out. thanks for the input bmorecam
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Old 10-20-2011, 02:29 PM   #12
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I dont think i can justify the 15c premium per litre here.
$95 to fill up with premium here, HELL NO
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Old 10-20-2011, 05:13 PM   #13
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Quote:
Originally Posted by booth8233 View Post
When i ran 87 my tips were clean, when i ran 89 they got blacker but didnt really see no difference.. im gonig to try 91, but idk i heard its just a waste.? i guess different opinions lol
The "its just a waste" is the OLD way of thinking... many newer cars will basically automatically tune themselves for the higher octane fuel....
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Old 10-20-2011, 06:13 PM   #14
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I noticed the difference with premium. I use shell (91 octane no ethanol) I could also get petro canada ultra 94 (94 octane has 10% ethanol). My question, stay with the 91 or go with the 94?
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Old 10-20-2011, 07:41 PM   #15
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Shell 93 I'm fine with paying 25 more cents
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Old 10-20-2011, 07:50 PM   #16
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go with the highest! Try to use the highest octane in your state. I can tell the difference from the different fuels just because of the 93 being way more responsive than regular. But just my opinion.
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Old 10-20-2011, 10:09 PM   #17
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And that won't mess up my engine (v6)? I have to get. So should I do 91 or 93?? This is stock engine with cai and axle back as of right now
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Old 10-20-2011, 10:43 PM   #18
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Quote:
Originally Posted by booth8233 View Post
And that won't mess up my engine (v6)? I have to get. So should I do 91 or 93?? This is stock engine with cai and axle back as of right now
engine runs a little better on high octane, but you don't need it.

My personal taste is to use it as I like the way the car drives with it and I have gone back and forth several times to test.
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Old 10-20-2011, 10:54 PM   #19
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get 93 if you can. some states (cali i think) only has 91
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Old 10-21-2011, 02:54 AM   #20
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I might go up in octane once gas prices go down. I think the last time i saw gas it was like 3.40 or so which makes no sense when oil is less than 90 a barrel.
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Old 10-21-2011, 09:47 AM   #21
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I could have put 93 in but I went with 91. Well see how this works
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Old 10-27-2011, 02:07 PM   #22
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Soo I see the difference. Sheetz I have black tips. Sunoco not as bad but almost barley. Hmm. Weird.
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Old 10-27-2011, 02:32 PM   #23
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I use 92 here in the 98310. It costs me after calculations... which i wont rehash here 76.00 a year. Plus I think no scientific fact that the car runs better.
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