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2010 5.7 liter. Does the dealer have to adjust anything to improve gas mileage?

Moved from Virginia altitude of 900 ft. to Colorado. Was getting average 17mpg. dropped to 14.5 mpg.

Posted by jeff payne on


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Bill Boyd

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To get an an out of paramaters setting for the air fuel mixture in the ECM I would consider a change in altitude of around 3000 feet would be necessary before the ECM would need re- programming
I would suggest that you run the fault codes as the MAP/BARO sensors may be faulty
also if the driving conditions have change ( flat to hilly) will account for lower fuel economy

Posted on Nov 24, 2015


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Moved from va. altitude of 900 ft. to colorado. getting poor gas milage. does the dealer have to adjust anything to improve gas milage

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Drop in gas milage with drop in altitude

I would guess your car was built to the Emission Standards
for your state,altitude etc

Still a big drop in mpg

If you ever moved, you may need your computer software
reflashed for lower elevation

I would guess the MAF Sensor was out of it's range

Check to see if any codes were stored
Need professional scanner

Look at freeze frame data unless you have been back for weeks

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I just moved to Colorado from Wisconsin and I'm

I believe they make 4 versions of that truck,as far as
emissions go,for different states

You may now need to have either a sensor changed
for the altitude or the pcm/ecm reprogramed

I would start by asking a dealer & check their
bulletins on that subject

A local repair shop may be a better place to actually
get the changes done

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Here is a picture of what i am talking about.

#1 is the air/fuel mixture, #2 and #3 are cold and warm idle screws.
#4 is a A/c idle adjustment.


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