Which gas to use? 85 or 88 octane? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 6 (permalink) Old 11-23-2008, 03:18 PM Thread Starter
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Which gas to use? 85 or 88 octane?

I've always filled up with regular unleaded. But I saw in the manual that the Commander should have 87 octane. In my area, regular is 85, and mid is 88. Should I bump up to mid? With gas prices dropping, I wouldn't mind doing that if it's going to be better for my car. What do you guys think? Would I even notice a difference?
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post #2 of 6 (permalink) Old 11-23-2008, 06:11 PM
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Originally Posted by stromboy84 View Post
I've always filled up with regular unleaded. But I saw in the manual that the Commander should have 87 octane. In my area, regular is 85, and mid is 88. Should I bump up to mid? With gas prices dropping, I wouldn't mind doing that if it's going to be better for my car. What do you guys think? Would I even notice a difference?
I think it would be easier for forum members to comment if you mention what engine you have. I have the 5.7 Hemi. 89 octane is recommended for performance but 87 octane is acceptable. I would not want to use 85 in mine.

I'm curious, where are you located?
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post #3 of 6 (permalink) Old 11-23-2008, 06:27 PM Thread Starter
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Oh sorry, that's a good point. I have a 3.7L. I live in Utah, btw.
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post #4 of 6 (permalink) Old 11-23-2008, 07:59 PM
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I wouldn’t worry about octane rating. The ECU will do the needed compensation. Actually it’s a little questionable if in fact the stated octane values are accurate.

If you are pulling a load or operating at high altitude, you may need to go up, but under normal operation, burn the cheapest you can get.

--Spike
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post #5 of 6 (permalink) Old 11-23-2008, 10:09 PM
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Use regular (85), it'll run just fine, and your wallet will be heavier for it. I use regular out here in CO and don't have any issues.

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post #6 of 6 (permalink) Old 11-23-2008, 10:12 PM
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I know that the 3.7L and 4.7L requires 87 octane.

You can check the users manual for more info.
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