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Old 06-10-2011, 12:13 PM   #1
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Recommended Fuel Myths (All Engines)

Alright, all this BS I've been seeing with a lot of myths on this forum about what fuels to use. The one that gets me is saying 93 Octane is required for the LS3 and L99. I've seen lots of people ask the same questions about Octane over and over again when the answers are contained in the last place people think to look; the manual. Don't worry LTT people the manual has you covered also. Here it is word for word from the manual itself section 8-44 Recommended Fuel:

If the vehicle has the 3.6L V6 engine (VIN Code V), use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, an audible knocking noise, commonly referred to as spark knock, might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. If heavy knocking is heard when using gasoline rated at 87 octane or higher, the engine needs service.

If the vehilce has the 6.2L V8 engine (VIN Code W) or the 6.2L V8 engine (VIN Code J), use premium unleaded gasoline with a posted octane rating of 91 or higher. For best performance, use premium unleaded gasoline with a posted octane rating of 93. You can also use us regular unleaded gasoline rated at 87 octane or higher, but the vehicle's acceleration could be slightly reduced, and a slight audible knocking noise, commonly referred to as spark knock, might be heard. If the octane rating is less than 87 a heavy knocking noise might be heard when driving. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible. Otherwise, you could damage the engine. If heavy knocking is heard when using a gasoline rated at 87 octane or higher, the engine needs service.

- First lets clear something up about 93 octane. While yes you'll get slightly better performance in your L99/LS3 it is likely a minimal benefit and probably a waste of money unless your going to racing or something to that effect. The spec for the L99/LS3 is clear as day 91 octane. It drives me nuts when I see people on this forum say otherwise especially when the difference per gallon between 91 and 93 octane can be .30 cents plus on the gallon.

As for the part about 87 octane being used in the LS3/L99 the engine computer retards the spark to compensate for the lower grade fuel. Commonly people here on Camaro5 complain that their car has reduced performance when the accidentally put 87 octane in and go back to 91 on the next tank. This is because the computer has not reset for the 91 octane and remedy I've seen for resetting the computer would be pulling fuses or unplugging the battery.

For the LTT guys sometimes I see stuff about using 89 or 91 octane in your cars. While it doesn't say anything about using a higher octane, why would you dump a more expensive fuel into your car when you'll get factory performance at 87?
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Old 06-10-2011, 12:17 PM   #2
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This is nice to have this all in one post. Thanks.

However, I sense some flaming in your future.
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Old 06-10-2011, 12:21 PM   #3
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This is nice to have this all in one post. Thanks.

However, I sense some flaming in your future.

So do I. Personally all I really take issue with people saying that 93 octane is a requirement for the LS3/L99 when people ask (who honestly don't know) what fuel to use. If some wants to use 93 octane because they want to, I don't have a problem with that by any means its just not the required fuel.
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Old 06-10-2011, 12:23 PM   #4
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Oyi....You might want to do some research on why Arizona has 91 octane fuel. I know the answer, but I want you to look it up. You'll get more out learning about it and why we have it here vs the east coast, south and some northern states.
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Old 06-10-2011, 12:24 PM   #5
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So do I. Personally all I really take issue with people saying that 93 octane is a requirement for the LS3/L99 when people ask (who honestly don't know) what fuel to use. If some wants to use 93 octane because they want to, I don't have a problem with that by any means its just not the required fuel.
I totally agree with your post, but as said above this will turn into flame war.
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Old 06-10-2011, 12:24 PM   #6
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It's in the manual that at least 91 needs to be put in the V8 or it WILL go into the lower performance table, and you have to do a fuse pull to get it to reset. I can verify all this from personal experience from when someone accidentally put 87 in my tank.

Edit: I've actually never seen someone say 93 was a requirement.
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Old 06-10-2011, 12:25 PM   #7
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I use the 89 octane in my LLT because it is actually 10 cents cheaper here in Iowa. Of course, it has 10% ethanol blend. I have used since day one without any issues.
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Old 06-10-2011, 12:27 PM   #8
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I use the 89 octane in my LLT because it is actually 10 cents cheaper here in Iowa. Of course, it has 10% ethanol blend. I have used since day one without any issues.
89 is cheaper than 87?

Wut?
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Old 06-10-2011, 12:28 PM   #9
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It's in the manual that at least 91 needs to be put in the V8 or it WILL go into the lower performance table, and you have to do a fuse pull to get it to reset. I can verify all this from personal experience from when someone accidentally put 87 in my tank.
True that is what it say, the battery one came from Fbodfather so who am I to say that won't work also?
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Old 06-10-2011, 12:29 PM   #10
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89 is cheaper than 87?

Wut?
The more ethanol in the blend the more money at the pump.
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Old 06-10-2011, 12:30 PM   #11
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In the past two years, I don't recall very many people saying 93 was required. Also it has been proven by the V6 guys, there is a slight performance gain using premium fuel although it may not be cost effective.
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Old 06-10-2011, 12:31 PM   #12
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In the past two years, I don't recall very many people saying 93 was required. Also it has been proven by the V6 guys, there is a slight performance gain using premium fuel although it may not be cost effective.
i stick with 87 for my V6 but there is a difference when using 91/93... i just dont think its worth the cost.
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Old 06-10-2011, 12:32 PM   #13
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I run 91 octance california gas from COSTCO in both my blown cars (see below). No issues or blown engines.
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Old 06-10-2011, 12:32 PM   #14
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Who buys an SS and then wants less performance out of it? If I wanted less than what I bought I would have bought the V6.
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Old 06-10-2011, 12:33 PM   #15
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Oyi....You might want to do some research on why Arizona has 91 octane fuel. I know the answer, but I want you to look it up. You'll get more out learning about it and why we have it here vs the east coast, south and some northern states.
Old CA would have us driving electric motorbikes if they had their way....
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Old 06-10-2011, 12:34 PM   #16
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I run 91 octance california gas from COSTCO in both my blown cars (see below). No issues or blown engines.
ofcourse not they are already blown.....
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Old 06-10-2011, 12:38 PM   #17
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Who buys an SS and then wants less performance out of it? If I wanted less than what I bought I would have bought the V6.

LMAO You have a point there!!
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Old 06-10-2011, 12:42 PM   #18
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... Also it has been proven by the V6 guys, there is a slight performance gain using premium fuel although it may not be cost effective.
Yep, this has been well documented by Scrming. The LLT will keep advancing timing until it detects knock. It's been shown that when running with 87 octane, quite a bit of timing is pulled. Others have said their car runs smoother with higher octane. Personally, I've been using Shell Vpower and I don't have any complaints—car seems nice & happy.

Manual says "87 or higher". I opted for higher. It really amounts to only 3 or 4 bucks extra per fillup. We're already getting raped at the pumps, so an extra couple of bucks doesn't really worry me in the grand scheme of things
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Old 06-10-2011, 12:44 PM   #19
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I love seeing people fill their vettes with 87
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Old 06-10-2011, 12:47 PM   #20
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Most everywhere I've been, there's usually only a ~.10 diff in 91 and 93. I always use 93, even before I got the blower and supporting mods.

I'm not going to cheap out on the fuel for car. 0.10/g for even a full tank is nothing compared to the amount of $$ in my car.

Plus, knock on a blower engine isn't something I want to play around with by using lower.
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Old 06-10-2011, 12:48 PM   #21
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Around here there is a 30 cent difference between 87 and 93. I've never seen 30 cents between 91 and 93, but maybe its that way in Arizona.

While yes, the SS will run on 87, it will reduce performance significantly. Also note that when reducing performance, usually mpg suffers too. So, you can actually spend more money on 87 than on 93.

Putting anything other than the recommended fuel in the car is just stupid and a waste. Let's say you burn 20 gallons a week, at a 30 cent difference. That's $6 a week for the proper fuel. that's an extra $312 dollars a year. You figure most people have payments, and when you plug that into the overall yearly expense, these cars probably cost everyone at least $4K-$5K a year, whats an extra $312?

The bottom line is, premium is recommended, so that is what I run. And, that is what everyone should run, and if you are that worried about a few extra dollars a fill up, then you bought the wrong car.
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Old 06-10-2011, 12:51 PM   #22
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Around here there is a 30 cent difference between 87 and 93. I've never seen 30 cents between 91 and 93, but maybe its that way in Arizona.
The 93 pumps are a rarity out here in Arizona. Every one I've encountered had at minimum a $.25 markup over 91.
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Old 06-10-2011, 12:52 PM   #23
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I love seeing people fill their vettes with 87
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Old 06-10-2011, 12:53 PM   #24
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89 is cheaper than 87?

Wut?
Yeah 89 is cheaper than 87 here, and 91/93 is usually only 20 cents more than the 89. Right now, 89 is $3.42, 87 is $3.49, and 91/93 is $3.73.

If I am not mistaken we get a break on using Ethanol blended fuels because it requires corn and that is the main crop that we farm here in Iowa.

EDIT: Fixed fuel prices. Double-checked and I was a little off.
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Old 06-10-2011, 12:56 PM   #25
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Just love all the opinions vs. facts on fuel octane.

I most enjoy when someone posts that they can feel the seat of the pants difference between 91 and 93 octance fuel. Very amusing stuff right there...

To the uninformed that believe all the octane hype, more octane does not equal more power. It depends on a number of factors as to whether or not more octane helps or not. For instance, my ZX-14 Ninja made its highest dyno numbers on 87 octane fuel. Its an N/A motor. If you are boosted, or have raised stock compression, more octane really helps you run more ignition timing for more power.

Higher octane means that more knock retardant chemicals have been added to the fuel. These chemicals reduce knock and they can reduce power since for each gallon of gas, the retardants replace a certain volume of the gas. This lowers the amount of BTUs (heat energy) that can now come from the gas. You can make up for this and get ahead of this if you are tuned to take advantage of higher octane. If you are not tuned, then you lose power and decrease fuel mileage.

In Arizona, we only get 91 octane since all our fuel is surplus from the nearby California fuel market and they only get 91 due to their smog laws.

So are the ignition tables in a stock, non-tuned Camaro going to be able to use the 2 extra octane in 93 vs. 91, to run more timing and result in more power?

Can a dyno measure a difference between 91 and 93 on a stock engine and tune?

Stock engine/Stock tune mentioned here, so all you blown/turbo'd/Nitrous guys with tunes don't have to jump in here to explain how higher octane is a must for your applications.
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