85 octane fuel in Denver - Focus Fanatics
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Old 03-12-2005, 07:44 PM   #1
dsaitz
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85 octane fuel in Denver

Anyone else use 85 octane fuel (regular) in Denver versus the 87 octane fuel
requirement listed in the owners manual????


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Old 03-13-2005, 10:48 AM   #2
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I have no problem running 85 in my wagon. But it does run better when I put in the good stuff.

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Old 03-16-2005, 11:37 AM   #3
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I use 85 and my car runs fine
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Old 03-16-2005, 02:29 PM   #4
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We're using 87. now. In the mountains or on foothills grades it seems to make a difference. I'm guessing the computer was detecting some knock and was retarding the timing a little.
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Old 03-16-2005, 02:41 PM   #5
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Do they offer that 85 because of the elevation of Denver? Higher elevation=less air, less air=less fuel = no need for higher octane?
i dunno just throwing out an idea
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Old 03-17-2005, 09:21 AM   #6
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Its more of an emissions issue. Since there is less air in the combustion process the lower octanes result in quicker ignition and a more thorough burn. The lower octanes do however increase the chance of ping and knock. High octane fuel burns slower.You tend to get more pollution due to incomplete combustion because the fuel charge is richer (less air) to start with and doesn't ignite as quickly.
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