Elevation affect mpg? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 9 (permalink) Old 07-13-2009, 01:31 AM Thread Starter
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Elevation affect mpg?

I usually get around 14-15 all in town driving. I live in San Angelo Texas and the elevation of San Angelo is 1919ft. I went to Ruidoso, NM and in all the hills,strictly in town driving, I consistently in three tanks averaged 19.5 mpg. So I was wondering if elevation effects mpg. The elevation of Ruidoso is 6920ft. Driving on the highway I averaged 21 on two tanks. I donít see how this is possible and thought that the elevation can affect mpg. I usually get about 20 on the highway. Any thoughts?

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post #2 of 9 (permalink) Old 07-14-2009, 07:39 PM
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Re: Elevation affect mpg?

I was in Ruidoso over the 4th of July hauling a 20'ft car hauler and my mpg was alot worse then when I pull back here in Dallas.
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post #3 of 9 (permalink) Old 07-15-2009, 01:05 AM
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Re: Elevation affect mpg?

Those hills certainly have an effect.

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post #4 of 9 (permalink) Old 07-15-2009, 02:38 PM
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Re: Elevation affect mpg?

It's all about driving style.

Depending on speeds, I can either get better than usual or much worse than usual mileage when I'm in the mountains. Slower speeds will greatly help mileage. Remember that when you coast at under 2000 RPM's, the 7.3L will shut down the injectors. Get a nice long grade, and you can coast for a few miles without using a drop of fuel. That's one good way to boost mileage.

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post #5 of 9 (permalink) Old 07-15-2009, 07:35 PM
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Re: Elevation affect mpg?

I always get better mileage in the mountains in Colorado than I do on the plains. I credit my driving style that takes advantage of the long grades...

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post #6 of 9 (permalink) Old 07-16-2009, 06:57 PM
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Re: Elevation affect mpg?

I believe that elevation by itself will affect mileage. your MAP sensor sees less air, so it injects less fuel until you come on to boost. it's almost like accelerating lighter without changing your driving habits.

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post #7 of 9 (permalink) Old 07-16-2009, 11:18 PM Thread Starter
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Re: Elevation affect mpg?

That is kinda what i thought might be happening.

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post #8 of 9 (permalink) Old 07-18-2009, 02:59 AM
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Re: Elevation affect mpg?

yeah i live in the mtns and it does effect it
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post #9 of 9 (permalink) Old 01-04-2010, 03:15 AM
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Re: Elevation affect mpg?

would lighter air due to elevation lead to reduced wind resistance on the truck itself? There is a reason passanger jets fly at 30k+ feet and I don't think it is for fun.
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