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Old 10-20-2009, 10:57 AM   #1
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Gas and Preventive Maintenance

What gas does everyone use? I started out with regular unleaded and went to super. Would premium do anything?

Anyone use Deep Creep on their jeep? The stuff you pour into your brake vacuum line that supposed to get rid of all the carbon buildup.

Any other good preventive maintenance ideas?

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Old 10-20-2009, 11:33 AM   #2
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What gas does everyone use? I started out with regular unleaded and went to super. Would premium do anything?

Anyone use Deep Creep on their jeep? The stuff you pour into your brake vacuum line that supposed to get rid of all the carbon buildup.

Any other good preventive maintenance ideas?
I use what my owners manual recommends... which is regular unleaded... I have tried various fuel additives such as STP fuel cleaning additives, however, I haven't noticed any change...

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Old 10-20-2009, 12:14 PM   #3
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Using a higher octane fuel in an engine that does not require it provide no benefit and is throwing away money.

Petroleum Proof, High-Performance Gasolines
Popular Hot Rodding Magazine, January 1998
By Scott Parkhurst
Octane is a measurement of a fuel's resistance to ignition. Ideally, the air/fuel mixture will ignite at the proper time and burn smoothly through the power stroke. The idea is that one powerful combustion of the air/fuel mixture is better than several randomly-ignited small flame fronts. When you can precisely control the point at which the fuel will ignite, maximum performance of the engine can be achieved, and power-robbing knock and ping will be eliminated. Knock and ping are a result of abnormal ignition, or multiple flame fronts colliding within the combustion chamber during the compression stroke.
All reputable fuel manufacturers determine the octane rating of their gasoline in the research lab using a special, dedicated single cylinder engine. Comparing the gasoline to a series of standard reference fuels in the test engine results in either a research octane number (RON) or a motor octane number (MON) depending on a set of operating conditions. The RON is determined with the test engine operating at 600 rpm, at standard barometric pressure, and the intake air temperature set at 125 degrees Fahrenheit. RON is primarily used to address part-throttle knock and ping problems. The MON addresses wide open throttle operation and is determined with the test engine spinning at 900 rpm, also at standard barometric pressure, and the intake air temperature pumped up to 300 degrees.
The best predictor of a fuel's performance in a street/strip machine is the Anti-Knock index (AKI). This is simply the average of the RON and MON numbers, or (RON + MON) / 2. Most all octane ratings posted at the pumps are determined by this AKI formula, and are the minimum values you could expect to see. The minimum octane requirement
of your engine is determined by several variables besides the compression ratio. The engine and cylinder head configuration, air/fuel mixture, timing, coolant temperature, atmospheric pressure, relative humidity, and ambient air temperature will also affect the octane required to make your mill produce maximum power.
The burn rate of a fuel is a measurement of the time required for complete combustion of the air/fuel mixture. The notion that octane ratings affect the burn rate of fuel is about 180-degrees from reality; burn rate is a function of several variables, and the two are completely independent, although there is generally a correlation between octane ratings and burn rates.

What Does "High Octane" Mean?
[AWN] Higher-octane fuel isn't harder to ignite in the usual way (that is, with a spark); the octane rating just indicates how easily the fuel can SPONTANEOUSLY ignite before the flame-front reaches it. "Spontaneous pre-ignition" is just another phrase for "detonation" or "knock"; higher-octane fuels resist knocking better than low-octane fuels.
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Old 10-20-2009, 12:16 PM   #4
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Premium (89, 91, 93 etc. octane) will do absolutely and literally nothing good for your engine. In fact, higher octanes are slower to ignite and contain no added power, injector cleaners, etc. than standard 87 octane gasolines do. A gallon of 87 octane has the exact same energy content that a gallon of 93 octane fuel does. Higher than required octanes can even actually leave more deposits behind because they are slower to ignite.

Octane has just one purpose in life... to help prevent the gasoline from igniting prematurely from extra-high engine compression like high-performance car engine have. Since your Jeep does not have a high compression engine, running 89 or higher octane is a 100% compete waste of $$$ and may in fact actually leave your combustion chambers dirtier than they would be with the factory recommended 87 octane.

Gasoline manufacturers are to blame for all the mystery of high octane "premium" fuels... they purposely keep implying premium fuels are better so some people feel like they're doing the right thing by running them but they're not. They are just much more profitable for the manufacturers so they purposely don't push the fact premium fuels are of no help for 99% of the cars on the roads.
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Old 10-20-2009, 01:04 PM   #5
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I agree with everyone, I go through a full tank every 3 days and run regular without any problems. I have been in the automotive business for over 40 years and can tell you all that crap is just a money maker for them.
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Old 10-20-2009, 08:52 PM   #6
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I agree... as long as the engine doesnt knock, lower octane is fine and cheaper. My wife Lincoln Aviator specifies 91+ octane in the manual... after running 87 in it for a while with no knocking, I consulted a ford mechanic and he said that he would never run anything but 87 in it.
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Old 10-21-2009, 09:26 PM   #7
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I usually use 85 octane and average right at 20 - 21 mpg. When it gets bitter cold (-10 to -35 or so) I go with the 89 octane that is alcohol blended. Using the gasohol blend really sucks the mpg down, but when it's that cold I'm more interested in the fuel not freezing up than mpg!
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Old 10-21-2009, 09:36 PM   #8
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Which octane number do you use in the US?
Here in Europe we use the RON.
IMO you should use the AKI (RON+MON)/2.

Then your 91 octane fuel should be the same than our 95 Oktan called "Euro Super".
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Old 10-21-2009, 10:36 PM   #9
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87 is our regular. 89 is considered plus and 91 and 93 are super/premimum. I believe in higher elevations, 85 octane is sold.
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Old 10-21-2009, 11:14 PM   #10
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87 for me
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Old 10-21-2009, 11:24 PM   #11
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Which octane number do you use in the US?
Here in Europe we use the RON.
IMO you should use the AKI (RON+MON)/2.

Then your 91 octane fuel should be the same than our 95 Oktan called "Euro Super".
It is somewhat altitude specific as to the octain levels of the different grades.

For instance 91 octane would be the premium fuel in higher altitude states and you can find 93 or 94 octane fuel as the premium octane at lower altitudes.
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Old 10-22-2009, 01:09 AM   #12
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Originally Posted by Rubi Unlimited View Post
It is somewhat altitude specific as to the octain levels of the different grades.

For instance 91 octane would be the premium fuel in higher altitude states and you can find 93 or 94 octane fuel as the premium octane at lower altitudes.
Even 89 and 87 octane would be considered high-octane fuels at high altitude like parts of Colorado have at. 85 octane is all that's needed at higher altitudes, only 87 or 89 at the most would be what a high performance engine would require to prevent pinging at a high altitude.
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Old 10-22-2009, 01:20 AM   #13
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We only have "EuroSuper" (91 octane), "SuperPlus" (94 octane) and the new "Ultimate" (98 octane). Last year they stopped producing the "Regular" (87 octane).
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Old 10-22-2009, 01:23 AM   #14
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European octane ratings are measured very differently than US gasolines are. Your octane ratings don't correspond to US octane ratings Nicolas. Our 87 octane is probably roughly equivilent to your 91 octane.
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Old 10-22-2009, 01:31 AM   #15
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I was talking about the US octane, not about the European oktan.

Here´s a list. In the right column (AKI) you can see the US octane number. In the left column you can see the octane number from nearly all other countries over the world (RON).

And you´re right. Your 87 octane is like our 91 oktan. But that´isn´t available for over a year. We only have what you would call 91 octane.

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