85 or 87 Octane?

Phil T · **Posted:** Fri Sep 22, 2006 10:00 pm

I saw a thread on this in the general forum. Just wondering what everyone is using around here.

I have been using 87 mid-grade since new.

Since we now get to pay more for gas then the rest of the country :evil:

(Ohio is running around $2.00 per gallon!!) I was wondering if it is worth it to continue to pay for the 87 octane?

Skyjump136 · **Joined:** Tue Jul 05, 2005 6:50 pm **Posts:** 1633

I've always used 85 in the KJ...no problems to date.

pinecone · **Posted:** Sat Sep 23, 2006 1:46 am

So far the Jeep has digested the cheapstuff with no worries.

Brigrat · **Joined:** Sun May 21, 2006 6:17 pm **Posts:** 92

I bought my jeep in CA, where the options were 87, 89, and 91. When I moved to NM, the options were 86,88, and 90. I just figured that with the CA emissions package I better go 88...was I wrong?

Skyjump136 · **Joined:** Tue Jul 05, 2005 6:50 pm **Posts:** 1633

Not sure about the CA emissions, but in Colorado you can get away with the lower octane fuel because of the higher elevation.

Brigrat · **Joined:** Sun May 21, 2006 6:17 pm **Posts:** 92

I am at about 3600 Feet, how high are you?

broncsrule · **Posted:** Sun Sep 24, 2006 2:35 pm

Denver is at 5280(Mile High City). Skyjump is "down in the Springs", elevation of 6035 ft.

Kugellager · **Posted:** Sun Sep 24, 2006 6:07 pm

And when we do our runs out here in CO most are on the 7000-11000ft range.

Our manual recommends mid-grade if we are towing or driving in mountainous terrain.

I use 85 most of the time but use 87 octane (or top off with 91 to split the difference) when I go into the mountains.
I have noticed a difference when going up the steep grades along I-70 and other roads. I had a tank full of the 85 octane one time and the Jeep seemed a lot more sluggish going up Floyd Hill on my way up to Jones Pass. I have made this runs a few times which is why I noticed the difference.

John
];')

RkyMtnKJ · **Posted:** Mon Sep 25, 2006 11:26 am

85 when im along the front range but 87 is as low as we get in Durango..no problems to date just my gas mileage...wish there was a throw up icon..

Tokyojoe · **Posted:** Mon Sep 25, 2006 2:28 pm

How's this?

broncsrule · **Posted:** Tue Sep 26, 2006 12:53 am

Quote:

I'm not "down in the Springs." I'm down in the "Rock"...Castle Rock. About 6500 feet here.

Close enough...You can spit on the springs from that "rock" :lol:

blake1827 · **Posted:** Thu Nov 09, 2006 11:22 pm

At altitude the octane can be reduced, I used 85 in my '98 TJ for years. But now I have a CRD

http://www.chevron.com/products/prodser ... tane.shtml

85 or 87 Octane?

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