[jdasnt3]

It's like buying octane boosters. Waste of money.

[fastball]

You won't get a performance boost by using 100 octane......

However......

If you look for pure gas, as in 100% gas with 0% ethanol, that can actually help pep up your engine and improve fuel economy. Not every gas station carries it, they're sort of few and far between. You can look on pure-gas.org for your closest station. It's not cheap either, with regular 87 octane going for about $3.79/gal.

[cmitchell17]

Originally Posted by ChevyRules

Why were you using 89 and mixing 89 with 93 to get it to 91? 93 is perfectly fine for the car and is the recommended gas.

I just wanted to see if it would knock with 91, and it did.

Sent from my XT1635-01 using Tapatalk

[cmitchell17]

Originally Posted by fastball

You won't get a performance boost by using 100 octane......

However......

If you look for pure gas, as in 100% gas with 0% ethanol, that can actually help pep up your engine and improve fuel economy. Not every gas station carries it, they're sort of few and far between. You can look on pure-gas.org for your closest station. It's not cheap either, with regular 87 octane going for about $3.79/gal.

All of the non-ethanol gas around me is all 87 octane though? And yes you will get (1-(14.1/14.7))=4% better fuel economy and probably lose that 4% to knock retard. And you can compare that to at least the 10% extra you have to pay for non ethanol gas.

Sent from my XT1635-01 using Tapatalk

[TJay74]

Originally Posted by fastball

You won't get a performance boost by using 100 octane......

However......

If you look for pure gas, as in 100% gas with 0% ethanol, that can actually help pep up your engine and improve fuel economy. Not every gas station carries it, they're sort of few and far between. You can look on pure-gas.org for your closest station. It's not cheap either, with regular 87 octane going for about $3.79/gal.

Man, you all are getting gouged, I pay $2.69 for 91 octane 100% gas in the OKC metroplex.

There is some confusion though with what is being said, yes pure 100 octane will not give a "performance boost" but 4-6 gallons of it will raise you up to 93 octane and all but eliminate the chance of detonation.

With GM now saying to only run 93 octane in the Camaro SS/ZL1 it is now apparent that the powertrain calibration was done on 93 and not 91 octane.

[gr120994]

Are cars with California emissions able to take advantage of 93 octane fuel?

[ZL1 1LE]

Originally Posted by TJay74

Man, you all are getting gouged, I pay $2.69 for 91 octane 100% gas in the OKC metroplex.

There is some confusion though with what is being said, yes pure 100 octane will not give a "performance boost" but 4-6 gallons of it will raise you up to 93 octane and all but eliminate the chance of detonation.

With GM now saying to only run 93 octane in the Camaro SS/ZL1 it is now apparent that the powertrain calibration was done on 93 and not 91 octane.

What's the source of GM saying to only run 93?

[TJay74]

The owners manuals for all of the 6.2l vehicles all say now to run 93 octane and that if engine damage occurs running anything less it could void the warranty coverage.

[ZL1 1LE]

Originally Posted by TJay74

The owners manuals for all of the 6.2l vehicles all say now to run 93 octane and that if engine damage occurs running anything less it could void the warranty coverage.

Recommended in the 6.2. Required with the supercharged 6.2 with the caveat that using 91 will reduce performance and fuel economy. Voiding the warranty only comes into play if using less than 91 in the supercharged 6.2. A good deal of the country does not have ready access to anything higher than 91.

[laynlo15]

I have a few different tunes set up, but with my 105 tune I run about 5 degrees more timing then my 93 tune. I did pick up more the a tenth and 2 mph in the 1/8 mile which would calculate to about 3 tenths in the quarter. Unless you tune for the higher octane I agree you probably one see any gains.

[TJay74]

Originally Posted by ZL1 1LE

Recommended in the 6.2. Required with the supercharged 6.2 with the caveat that using 91 will reduce performance and fuel economy. Voiding the warranty only comes into play if using less than 91 in the supercharged 6.2. A good deal of the country does not have ready access to anything higher than 91.

The updated manual now says all of the 6.2's now are required to run 93 and a warning of engine damage if running 87 that wont be covered under warranty.

[Mountain]

OK, I'm going to say a few things that haven't already...

Should you? No, I would not use it. Why? Nearly all available, at-the-pump, 100-octane has lead in it. This is not an issue if you do not have catalytic converters, but you most likely do (I don't know what you've done to your car, but the cats are probably still there). Lead can and will contaminate the catalyst. [Side note, can you guess a major reason why the ZDDP (zinc and phosphate package) in oil was greatly reduced almost a decade ago?]

HOWEVER, if you want to try it, only do it in a small dose, like a gallon or two.

BUT, I'll tell you exactly what you will find. And this is from experience. You will not gain more [peak] power, although you may feel that you do. What you will likely feel is that the engine is more lively throughout the entire RPM band, regardless of nearly any condition the engine is under.

What I mean is this: I did this in my old 2012 Mustang GT during a summer. I only put in like 2 or 3 gallons mixed with about a gallon of old 93-octane. Over the course of about two days, I noted what I said above. Both days were very hot and humid. No matter how hard I drove the car, or what type of driving I did in the car, the engine just felt like a bull. But it didn't seem to have any higher of a PEAK power level. I even was able to do an autocross with the car during that period. I know what you're thinking - "Pff, autocross". But when you're banging the car around, going up and down the RPM, during very hot and humid weather in a setting that gives little airflow for good cooling... Also, yeah, Coyote to LT1. But both engines have high compression V8's that get strung out to about 7,000RPM (6,600 RPM for the LT1 - close) and the 2011-12 GT's have worse cooling than the 2016-17 Camaro's. The magnitude in which this will occur would likely be less in the Camaro, but similar.

[ZL1 1LE]

Originally Posted by TJay74

The owners manuals for all of the 6.2l vehicles all say now to run 93 octane and that if engine damage occurs running anything less it could void the warranty coverage.

Originally Posted by TJay74

The updated manual now says all of the 6.2's now are required to run 93 and a warning of engine damage if running 87 that wont be covered under warranty.

Big difference between these 2 posts.

[Oil Man]

Originally Posted by TJay74

Though from the info I found on the tank size the mix ration is closer to 6 gallons of 100 to the rest of the tank will get you to 93.6 octane.

Hm. I'll do some more research. I found a link to someone's site that provided a calculator for my 4.25 number, but I am willing to be wrong. What I do know is that the conditions that I have sometimes observed where the engine can knock on 91 seem to be fixed after blending at the ratio I mentioned.

Originally Posted by gr120994

Are cars with California emissions able to take advantage of 93 octane fuel?

Yes. If you can find 93. My California car was noticeably happier on a recent road trip through Texas running 2-3 tanks of 93. And most of the manufacturers are no longer doing the 49-State/California emissions thing any longer. The Camaro I bought in Ontario California is mechanically identical to the car you can buy anywhere else in the US.

Originally Posted by Mountain

Should you? No, I would not use it. Why? Nearly all available, at-the-pump, 100-octane has lead in it.

This may still be true in a lot of places, but in any larger city market plus California that is under a CARB-style emission control program, the only fuel being sold with any lead at all in it is 100LL Aviation fuel at the general aviation airports. You cannot sell/ship leaded motor fuel here anymore, at all. Hell, they're making people sign forms when you buy race gas in quantity here that you're going to use it for off-highway purposes.

Anywhere else where lead is still permitted, just look carefully at the pump. The EPA mandates disclosure of lead in the fuel and it should be fairly prominent on the pump.