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  #13  
Old 04-05-2011, 09:33 AM
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Re: 87 or 89 octane

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Originally Posted by jgc4ever View Post
Isn't 89 octane = 10% ethanol which they call super unleaded? It is where I live. I only use 87 octane in my 4.7 L V8 WK. When I had a 98 ZJ 6 cylinder I used 89 octane and had to replace the fuel filter/fuel pump. 87 octane is also 10 - 15 cents more expensive here than 89 octane. In Nebraska.
It varies depending on where you are. In rural areas I've seen some grades of fuel being E10 and cheaper due to the subsidies given to ethanol while the regular and premium grades have no ethanol. However, it is not that way everywhere. In more developed areas everything is E10- even if I wanted to get my hands on non-ethanol fuel around STL I'm not sure where to go for it. Everything is 10% ethanol (well, not the diesel or E85, but you get the point ). Modern vehicles should have no problem running E10; most everything for the last few decades has been built with that blend in mind. But the grade of gas has nothing to do with it being an ethanol blend; octane rating is a measure of tendency toward preignition.


Quote:
Originally Posted by 77rednecktruck View Post
I don't see anyone in this thread being "cheap" because of gas choice. I see a question about how not many other vehicles use 89 octane gas therefore it sits longer in the tank at the gas station (which we have answered that is is mixed at the pump so that is not a concern) and could possibly be stale.

It seems you have some jealousy over the Hemi. You seem to be in every thread like this trying to justify the v6 decision you made.
If you read the thread, you learned that there's most often no such thing as 89 octane fuel at your local station. It's all blended at the pump. Reading is fundamental. Stale gas at a gas station is a nonevent- unless you're the only one using that station, the fuel in the tanks is likely replenished a couple times a week.

And I'm not the one starting threads about HOW MUCH BETTER the Hemi is. It's more like the opposite- you Hemi folks feel the need to circle jerk the 8 cylinder at every opportunity. I'm still very pleased with my vehicle, but don't feel the need to kick open a new thread every two weeks to state how I love the power or how I'm really getting butthurt over putting midgrade into it.

I'm just stating that if you're buying for the power, it's foolish to purchase fuel that cuts that power back. You spent more when buying the vehicle. You spend more for more frequent fuel ups. What's another 15 cents/gallon?
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Old 04-05-2011, 09:44 AM
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Re: 87 or 89 octane

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Originally Posted by 77rednecktruck View Post
I don't see anyone in this thread being "cheap" because of gas choice. I see a question about how not many other vehicles use 89 octane gas therefore it sits longer in the tank at the gas station (which we have answered that is is mixed at the pump so that is not a concern) and could possibly be stale.

It seems you have some jealousy over the Hemi. You seem to be in every thread like this trying to justify the v6 decision you made.
Quote:
Originally Posted by Technosavant View Post
If you read the thread, you learned that there's most often no such thing as 89 octane fuel at your local station. It's all blended at the pump. Reading is fundamental. Stale gas at a gas station is a nonevent- unless you're the only one using that station, the fuel in the tanks is likely replenished a couple times a week.
Please note the words in parentheses in my post. Who needs reading lessons??? I was restating the question that was posted.

I was happy to pay more for my Hemi, don't mind the lower gas mileage, and put 87 in my tank. I didn't notice any change in mileage or power after a few tanks of each so I might as well save the $3 or so every fill up.
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Old 04-05-2011, 10:13 AM
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Re: 87 or 89 octane

I started this thread and I never said anything about the cost of the midgrade. I have no problem paying the extra 10 cents. My question was about how often this fuel is used and that question was answered I did not know it was mixed at the station. I was happy to pay extra for the hemi. I am happy to pay extra to fill it up. I am happy to have the extra power and I am happy to have an engine that is going to last longer.
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Old 04-05-2011, 11:00 AM
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Re: 87 or 89 octane

Use 87 dont mix whit any other ...i been using 87 on my 2001 and 2001 Cherokee and i never do anything to the car ...trust me is the best for jeep i know for a fact from other guys using different gas
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Old 04-05-2011, 11:09 AM
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Re: 87 or 89 octane

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Originally Posted by 77rednecktruck View Post
I was happy to pay more for my Hemi, don't mind the lower gas mileage, and put 87 in my tank. I didn't notice any change in mileage or power after a few tanks of each so I might as well save the $3 or so every fill up.
That's because butt dynos are notoriously poorly calibrated. $3 every fill up is a pittance. You're not getting everything you paid for because you aren't giving the vehicle what it was designed to use.
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Old 04-05-2011, 11:22 AM
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Re: 87 or 89 octane

Since the EPA restrictions on old octane enhancements (TEL...aka..."leaded", MTBE, MMT), ethanol has become the primary octane booster in vehicle fuels. If there are fuels available without a % of ethanol, how are they meeting the octane requirements without the ethanol? We've long since moved beyond leaded fuels, but I thought the EPA restrictions on non-ethanol enhancements were nationwide due to potential degrading of catalytic converters.
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Old 04-05-2011, 11:26 AM
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Re: 87 or 89 octane

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Originally Posted by Technosavant View Post
That's because butt dynos are notoriously poorly calibrated. $3 every fill up is a pittance. You're not getting everything you paid for because you aren't giving the vehicle what it was designed to use.
but even with the cheapo gas, it is still faster than the v6. And it sounds better while doing it.

I use 87 in everything I have, I guess it is just habit. I may notice a difference if I take my Jeep to the drag strip and do some testing, but I don't do that. I use 87 in every 4-stroke gas engine I own, I do not see the point in getting 89 if there is no benefit.

How much power does a WK2 Hemi lose while using 87 vs 89 octane? That would be cool to know.
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Old 04-05-2011, 11:31 AM
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Re: 87 or 89 octane

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Originally Posted by 77rednecktruck View Post
I don't see anyone in this thread being "cheap" because of gas choice. I see a question about how not many other vehicles use 89 octane gas therefore it sits longer in the tank at the gas station (which we have answered that is is mixed at the pump so that is not a concern) and could possibly be stale.

It seems you have some jealousy over the Hemi. You seem to be in every thread like this trying to justify the v6 decision you made.
I agree with Technosavant..... it is because they are too cheap. It seems like your doing your engine a disservice doing that. Manufactures learned that people are too cheap to pay for the gas that the engine really needed so they made it so the ECU can adjust so the cars can use 87 but there is a lost of power in doing this. People want a "powerful" engine but don't want to pay the cost to be the boss. It reminds me of a friend of mine who had a car that needed 93 but she always put 87 in it and kept bitching about it running like shit.
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Old 04-05-2011, 11:32 AM
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Re: 87 or 89 octane

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Originally Posted by 77rednecktruck View Post
but even with the cheapo gas, it is still faster than the v6. And it sounds better while doing it.

I use 87 in everything I have, I guess it is just habit. I may notice a difference if I take my Jeep to the drag strip and do some testing, but I don't do that. I use 87 in every 4-stroke gas engine I own, I do not see the point in getting 89 if there is no benefit.

How much power does a WK2 Hemi lose while using 87 vs 89 octane? That would be cool to know.
No argument on the sound, but if you REALLY want good sound, a member here (I forget who) had a Borla exhaust put on, and posted a YouTube clip of it. Now THAT'S awesome sound (I just crank up the stereo, myself..).

I remember a Car & Driver article from a few years back where they did comparisons of fuel types in given models. IIRC, if a vehicle wanted premium fuel, the drop in power (they measured at the wheels on a dynometer) was somewhere in the 5% range, but that varied a bit. Some cars varied a lot. Some almost none. But 5% stands out as the general average.

Given the engine to engine variances, that 5% is likely not even noticeable to the driver. But still, my wife's Acura specifies premium, and I've never fed it anything but. I stick to the manual's recommendations wherever possible, and I figure if the 30 cents/gallon was going to break us, we'd have been better off not getting a luxury brand.
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Old 04-05-2011, 11:50 AM
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Re: 87 or 89 octane

I use 87 in mine, its a 4.7 and I dont know whats recomended but 87 is what I use
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  #23  
Old 04-05-2011, 01:42 PM
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Re: 87 or 89 octane

My 2002 Ram 1500 had the 4.7 and the recommended fuel was 87 octane for that.
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Old 04-05-2011, 02:04 PM
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Re: 87 or 89 octane

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Originally Posted by Knightrider03m View Post
I agree with Technosavant..... it is because they are too cheap. It seems like your doing your engine a disservice doing that. Manufactures learned that people are too cheap to pay for the gas that the engine really needed so they made it so the ECU can adjust so the cars can use 87 but there is a lost of power in doing this. People want a "powerful" engine but don't want to pay the cost to be the boss. It reminds me of a friend of mine who had a car that needed 93 but she always put 87 in it and kept bitching about it running like shit.
I am not cheap. I don't think the extra $3/fill up is that big of a deal, even over the life of the vehicle. I simply do not notice a difference in power or mileage between 87 and 89. If I was cheap, I would have bought a KIA and sold my 4 dirt bikes a long time ago. If the manual stated that 89 is the absolute minimum, then I would have not even tried it but since it stated 87 is fine, game on. I am sure some people run 87 to save a few bucks, but I am not one of them.
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