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Old 07-14-2008, 10:19 PM   #1
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higher altitude

so since i been in colorado i have noticed that i get about 20 miles less on a tank of gas, can this have anythign to do with the fact that im at an higher altitude than south carolina...maybe do i need to adjust something...

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Old 07-14-2008, 11:58 PM   #2
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when was the last time you gave the jeep a tune up???
is your air filter clean?? Yea altitude will affect MPGs but not drastically. your Fuel injection system will auto adjust for the altitude. altitude will mostly kill your performance which means your prolly hitting the pedal a little harder as well.

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Old 07-15-2008, 10:35 AM   #3
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i gave it a tune up less than a month ago, all new plugs, filters, oil, tranny flush...mayeb im just not as easy on the pedal.
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Old 07-15-2008, 10:39 AM   #4
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Your engine makes less power at higher altitudes so you're probably pushing it a bit harder to compensate which will reduce your mpg. The Jeep automatically compensates by adjusting the air fuel mixture so it stays correct but with less air to compress, it feeds in less fuel to keep the mixture proper. With less fuel and air in the combustion chamber, it can't produce as much power as it does at sea level.

Onem more thing to know is you can run a lower octane like 85 up there at that altitude. With less air, the air fuel mixture isn't compressing to as high of a pressure as it does at sea level so it requires less octane to keep it from self-igniting. Running a lower octane like 85 is a good way to save $$ while not negatively affecting anything to do with the engine in the least. That's why you find lower octane grades of fuels in gas stations located at high altitudes.
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Old 07-15-2008, 10:46 AM   #5
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thanks, that makes since if i have a lil lesss power i would press the pedal harder to compensate, im still young and dont know how ot read speed limit signs..haha
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Old 07-15-2008, 09:27 PM   #6
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Quote:
Originally Posted by Jerry Bransford View Post
Your engine makes less power at higher altitudes so you're probably pushing it a bit harder to compensate which will reduce your mpg. The Jeep automatically compensates by adjusting the air fuel mixture so it stays correct but with less air to compress, it feeds in less fuel to keep the mixture proper. With less fuel and air in the combustion chamber, it can't produce as much power as it does at sea level.

Onem more thing to know is you can run a lower octane like 85 up there at that altitude. With less air, the air fuel mixture isn't compressing to as high of a pressure as it does at sea level so it requires less octane to keep it from self-igniting. Running a lower octane like 85 is a good way to save $$ while not negatively affecting anything to do with the engine in the least. That's why you find lower octane grades of fuels in gas stations located at high altitudes.
Is 85 a common offering in higher altitude areas?
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Old 07-16-2008, 10:13 AM   #7
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Originally Posted by ajtudor View Post
Is 85 a common offering in higher altitude areas?
Totally.

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