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Old 03-29-2012, 06:24 AM   #1
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85 Octane for JK?

I know the manual states 87 octane / regular required, but regular here is 85, not 87.

Is the manual not smart enough to say 87 normally but 85 is OK at higher elevations (CO, UT, MT, etc..) or should you run 87 anyway?

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Old 03-29-2012, 06:28 AM   #2
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85 octane at what? 6000 feet elevation? 87 octane is the sea level rating. In other words, you are good to go.

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I know the manual states 87 octane / regular required, but regular here is 85, not 87.

Is the manual not smart enough to say 87 normally but 85 is OK at higher elevations (CO, UT, MT, etc..) or should you run 87 anyway?

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Old 03-29-2012, 06:31 AM   #3
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85 octane at what? 6000 feet elevation? 87 octane is the sea level rating.
5000 - 14000ft

Usually around 5-11k
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Old 03-29-2012, 06:33 AM   #4
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You are good to go.

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5000 - 14000ft

Usually around 5-11k
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Old 03-29-2012, 06:33 AM   #5
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Yup. When I moved to Maryland, I was surprised to see that the regular was rated at 87 octane. Growing up in Lakewood, I was used to seeing 85...
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Old 03-29-2012, 06:36 AM   #6
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I'm at 32 feet elevation and I get nosebleeds. Ha ha!
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Old 03-29-2012, 06:37 AM   #7
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I'm at 32 feet elevation and I get nosebleeds. Ha ha!
I've never seen it happen, but I've heard when some of the tourists come here (flat landers) and try to drive up to Pikes Peak or Mount Evans (14,000+ ft summit) they pass out when they get to the top if they just flew in that day or something
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Old 03-29-2012, 06:41 AM   #8
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I've never seen it happen, but I've heard when some of the tourists come here (flat landers) and try to drive up to Pikes Peak or Mount Evans (14,000+ ft summit) they pass out when they get to the top if they just flew in that day or something
Both Top Gears (US and British) had episodes where they drove over mountains, and both heavy set hosts got light headed and had trouble breathing at high altitudes...

Thats why it takes so long to climb everest. you have to get aclimated to the lack of oxygen...
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Old 03-29-2012, 06:48 AM   #9
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The lower the air density the lower the cylinder pressures and at higher elevations there is less barametric pressure, sea level is 14.6 so at say 10K' you would be around 10psi +/-
You are fine with 85
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Old 03-29-2012, 07:00 AM   #10
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The air is so dense down here that a lot of mountain people have to get a back-pack mounted - air splitter to get rid of some of the extra oxygen, or they get giddy.
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Old 03-29-2012, 07:08 AM   #11
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Both Top Gears (US and British) had episodes where they drove over mountains, and both heavy set hosts got light headed and had trouble breathing at high altitudes...

Thats why it takes so long to climb everest. you have to get aclimated to the lack of oxygen...
in defense of REAL Top Gear, they did turn around at like 17,000 ft. Thats pretty high up there. Hell, Im in good shape but a lowlander and I had a hard time at 10,000'. I couldnt even imagine 15,000 or higher
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Old 03-29-2012, 07:12 AM   #12
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in defense of REAL Top Gear, they did turn around at like 17,000 ft. Thats pretty high up there. Hell, Im in good shape but a lowlander and I had a hard time at 10,000'. I couldnt even imagine 15,000 or higher
I think the Bolivia episode is the best
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Old 03-29-2012, 08:07 AM   #13
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It always sucks when I go to Montana in the summer with the 85 octane fuel that is there. I have experienced pinging from the low octane fuel. I usually continue to by 87 octane anyway. It is still cheaper than the regular fuel we have in California.
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Old 03-29-2012, 08:21 AM   #14
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Come on everyone, we all know that you should just stay in your jeep when climbing Everest. Then the air problem is solved and your butt will be all comfy because you'll have heat. Swaaaeeeeeet!
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Old 03-29-2012, 01:02 PM   #15
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I've never seen it happen, but I've heard when some of the tourists come here (flat landers) and try to drive up to Pikes Peak or Mount Evans (14,000+ ft summit) they pass out when they get to the top if they just flew in that day or something
My wife and I flew up from Texas (~600ft) last September and the first thing we did was drive up Mt. Evans and hike to the top.

We're both in really good shape, so there was no passing out, but we could certainly feel it. Had to sit down a couple times.
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Old 03-29-2012, 01:23 PM   #16
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My wife and I flew up from Texas (~600ft) last September and the first thing we did was drive up Mt. Evans and hike to the top.

We're both in really good shape, so there was no passing out, but we could certainly feel it. Had to sit down a couple times.
I don't think it's that common, but it does happen

I think it happens more with the train going up Pikes Peak also since it's a steady climb and you don't get out to look around on the way up
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Old 03-29-2012, 01:26 PM   #17
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I've still been running 87 since I moved here a couple weeks ago. Was too chicken to go to 85 since I've never seen it but I hear plenty of CO folks running it fine.
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Old 03-29-2012, 01:33 PM   #18
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I've still been running 87 since I moved here a couple weeks ago. Was too chicken to go to 85 since I've never seen it but I hear plenty of CO folks running it fine.
Well I've run it in other vehicles with no issues, and my Cobra is supposed to take 93 but 91 is premium here, and it's been working fine also

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