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Old 04-19-2012, 06:58 AM   #1
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Fuel grades?

Anyone notice major differences in the fuel grades or is it just as good using 87 oct with additive?

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Old 04-19-2012, 07:00 AM   #2
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The only difference using anything other than 87 is that you will spend more money.

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Old 04-19-2012, 07:14 AM   #3
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I have run 89 octane for all but two fill ups. Those two were 87. Engine was noticeably louder with 87. To me the extra $1.25 a tank is worth it. MPG is a hair better but probably less than 1 mpg gain.
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Old 04-19-2012, 07:14 AM   #4
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[QUOTE="The Ugly Jeep"]I have run 89 octane for all but two fill ups. Those two were 87. Engine was noticeably louder with 87. To me the extra $1.25 a tank is worth it. MPG is a hair better but probably less than 1 mpg gain. I have just over 12000 miles and it's a3.8
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Old 04-19-2012, 07:20 AM   #5
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93 here.....,.... Superchips
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Old 04-19-2012, 07:40 AM   #6
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There is zero advantage to running a higher octane than recommended by the manufacturer in any modern fuel-injected engine. If the engine is designed and programmed for 87 then 89 or 92/93 will have no effect other than to cause you to spend more money.

Any positive effects you notice are placebo effect.

However, if you've modified your engine programming (through chipping or a programmer) to advance timing then you should use the octane rating recommended by the chip or programmer.

Now there are differences in the fuel additives from different distributors though the additives are the same for all grades from a given manufacturer. So there may be an advantage in buy a brand name fuel (Shell/Marathon/Exxon) over what you get from your local Super Sloppy Mart.

FYI: http://www.ftc.gov/bcp/edu/pubs/cons...tos/aut12.shtm

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Old 04-19-2012, 08:14 AM   #7
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Octane rating is the measure of a fuel's resistance to pre-detonation. Higher compression engines need higher octane (more resistance to pre-detonation) to avoid the spontaneous, early detonation of the fuel mixture on the compression stroke, which is noticeable as engine knock or pinging. Higher octane fuel does not have more explosive energy than lower octane so unless you've upped your compression ratio or advanced your ignition timing, which is what the Superchips do for you, there is no advantage to running higher octane.

On high compression engines, the higher octane fuels don't make the power. They just keep you from blowing head gaskets due to uncontrolled explosions of the fuel.
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Old 04-19-2012, 08:29 AM   #8
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There is zero advantage to running a higher octane than recommended by the manufacturer in any modern fuel-injected engine. If the engine is designed and programmed for 87 then 89 or 92/93 will have no effect other than to cause you to spend more money.

Any positive effects you notice are placebo effect.

However, if you've modified your engine programming (through chipping or a programmer) to advance timing then you should use the octane rating recommended by the chip or programmer.

Now there are differences in the fuel additives from different distributors though the additives are the same for all grades from a given manufacturer. So there may be an advantage in buy a brand name fuel (Shell/Marathon/Exxon) over what you get from your local Super Sloppy Mart.

FYI: The Low-Down on High Octane Gasoline

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Old 04-19-2012, 09:08 AM   #9
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theoretically if your higher octane fuel was less ethanol, then you would see better mpg. $0.20/gal better? who knows...
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Old 04-19-2012, 09:44 AM   #10
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theoretically if your higher octane fuel was less ethanol, then you would see better mpg. $0.20/gal better? who knows...
Ethanol is actually used to raise the octane rating for gasoline. Pure ethanol has an octane rating of 113. But as you noted has less energy than gasoline. So it's possible to get worse mileage with higher octane fuel if the distributer is using ethanol as the sole octane booster.

On the other hand, ethanol absorbs water and as it does (in high humidity) it actually lowers the octane rating of the fuel it is mixed with so your higher octane pump gas may lose as much as 4% of it's octane rating as it ages in your tank.

But given that the EPA has banned all the good octane boosting chemicals and the guberment subsidizes the ethanol industry we have the byproduct of our elected officials.

All for our own good since they know best.
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Old 04-19-2012, 09:52 AM   #11
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Been using regular (85) with no issues
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Old 04-19-2012, 10:02 AM   #12
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Been using regular (85) with no issues
Altitude. 87 for the rest of us at sea level.
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Old 04-19-2012, 11:41 AM   #13
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I use 87 and "economy" modefor DD, the Unichip I have installed is tuned for 91 octane on "sport" mode so I'll fill up with 91 for wheeling trips and let her rip.
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Old 04-19-2012, 12:01 PM   #14
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My 2010 pings under load on 87 and 89, so I run 93. No ping.
Average mileage is 18mpg back and forth to work, 24-25 pure highway driving, calculated by hand.
Bone stock auto drivetrain, wheels, and tires. Just a spacer lift.

Just the facts.
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Old 04-19-2012, 12:59 PM   #15
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Quote:
Originally Posted by Mr. Sinister
My 2010 pings under load on 87 and 89, so I run 93. No ping.
Average mileage is 18mpg back and forth to work, 24-25 pure highway driving, calculated by hand.
Bone stock auto drivetrain, wheels, and tires. Just a spacer lift.

Just the facts.
We discussed this before. After installing the 35's and setting my tune to stock, the jeep would ping pretty good accelerating. Especially @ lower Rpms.
Doesn't do it tuned if I'm easy on the gas.
Also if I don't use Shell gas. If I'm near empty and fill up somewhere else I hear some light knock/ping under load.
With Shell gas she's quiet..... Strange
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Old 04-19-2012, 01:09 PM   #16
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Fuel

HI, use 87 reg. in my 2012, also used the same in my 07..
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Old 04-19-2012, 02:24 PM   #17
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I've got a shop that sells Regular and super (87 and 89) for the same price. I end up using the 89 but I've never seen or felt any difference when using other grades.
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Old 04-19-2012, 02:31 PM   #18
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Running 89 octane wouldn't be too bad. There probably is a slight difference but doubt the cost will out way it but I guess it could very slightly. Other then that, without a tuner higher octanes are not tuned for your Jeep. Tuners like Superchips can tune the engine for higher octane but without a tuner it just isn't worth it.
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Old 04-19-2012, 03:29 PM   #19
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Rather than trying to use mid-grade (89) or premium (91/93), you should be focused on using a top-tier gasoline like Shell and putting in the recommended regular 87 octane. Top Tier Gasoline

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Old 04-19-2012, 06:41 PM   #20
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Quote:
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We discussed this before. After installing the 35's and setting my tune to stock, the jeep would ping pretty good accelerating. Especially @ lower Rpms.
Doesn't do it tuned if I'm easy on the gas.
Also if I don't use Shell gas. If I'm near empty and fill up somewhere else I hear some light knock/ping under load.
With Shell gas she's quiet..... Strange
My Jeep likes Shell gas too
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Old 04-20-2012, 06:20 PM   #21
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It's funny, I use Shell exclusively. Still pings on 87 and 89.
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Old 04-20-2012, 06:23 PM   #22
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87 is same.
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Old 04-20-2012, 06:26 PM   #23
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All you guys talking about shell.. I haven't seen a shell gas station in 4 years

As to gas for your Jeep.. If your using anything other then 87 your wasting your money but the gas companies thank you
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Old 04-20-2012, 06:31 PM   #24
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I'm still on my first tank but that tank is 92 octane non-ethanol.

So far, the computer is telling me that I'm averaging 14.2 mpg.

Do I care? Not really, but I'm going to do it for a couple more tanks as an experiment.

Then I'll probably switch to 87 and never look back.
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Old 04-20-2012, 07:30 PM   #25
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I believe the 3.8l has knock control. No modern engine with it should ping regardless of load. If it is, it is a sign something else it not right (tune, plugs, knock s sensor, O2 sensor...)

OP, higher octane does not mean "better". If your engine does not need it, you are wasting your money. You will get no better performance either as you engine cannot benefit (unless you adjusted timing via chip or slapped on a supercharger)
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Old 04-20-2012, 08:16 PM   #26
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Quote:
Originally Posted by OH9JK

My Jeep likes Shell gas too


Both Valero and Sunoco the jeep pings. Shell she is quiet
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Old 04-20-2012, 10:19 PM   #27
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I believe the 3.8l has knock control. No modern engine with it should ping regardless of load. If it is, it is a sign something else it not right (tune, plugs, knock s sensor, O2 sensor...)

OP, higher octane does not mean "better". If your engine does not need it, you are wasting your money. You will get no better performance either as you engine cannot benefit (unless you adjusted timing via chip or slapped on a supercharger)
normally I would agree, but I have heard the difference on my 2010 first hand It doesn't sound like pre ignition knock though, it actually sounds like valve chatter, which also shouldn't be affected by octane at all, but running higher octane quiets it nonetheless. An oil change will also quiet it down for a few hundred miles.

I haven't tried different gas stations though... might have to shop around and see who has better gas.
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Old 04-20-2012, 11:56 PM   #28
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normally I would agree, but I have heard the difference on my 2010 first hand It doesn't sound like pre ignition knock though, it actually sounds like valve chatter, which also shouldn't be affected by octane at all, but running higher octane quiets it nonetheless. An oil change will also quiet it down for a few hundred miles.

I haven't tried different gas stations though... might have to shop around and see who has better gas.
I am curious about brand as well. Near me BP, Shell, and Mobil are all very common and readily available. I generally only go to one of the 3.
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Old 04-21-2012, 02:34 AM   #29
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When I had my 350Z, one of the guys on the monthly group drives we did in the summer time told me Shell was supposed to be the best. Apparently he and his brother who both had 370's send their oil off to some lab every time they change it and it always gets changed with some kind of "special" oil and one of the tips that they got from their lab guy is that Shell is the best to use. Obviously I can't really say how accurate that is, but I DO get better mpg off of it and the butt dyno likes it as well, but of course the butt dyno is subjective.

Octane ratings, always go with the mfr. recommended unless you're running some kind of special tuning, turbos, supercharged, etc. If you really are having problems on 87 in a non-modified Jeep, something is wrong. Either bad gas, or a mechanical issue.
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Old 04-25-2012, 11:13 AM   #30
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Quote:
Originally Posted by Jurhip View Post
I believe the 3.8l has knock control. No modern engine with it should ping regardless of load. If it is, it is a sign something else it not right (tune, plugs, knock s sensor, O2 sensor...)

OP, higher octane does not mean "better". If your engine does not need it, you are wasting your money. You will get no better performance either as you engine cannot benefit (unless you adjusted timing via chip or slapped on a supercharger)
If I were not getting 18/24 for fuel mileage, I might think something was wrong. I also don't seem to have this huge lack of power so many 3.8 owners complain of, mine gets down the road (and up the hills) just fine.

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