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Old 03-11-2014, 12:49 PM
Hicksjay Hicksjay is offline
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Join Date: Dec 2013
Location: Seattle
Posts: 12
Gender: Male
Vehicle: 2013 Ram 2500 Cummins Crew
Trim Level: SLT
Color: Blue
Engine: 2011-20?? 409ci (6.7L) Cummins Turbo Diesel 350hp 800lb/ft
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Default 3000 mile Voodoo?

Hey there,

New Cummins owner.
Moved last week towing about 7000lbs in my trailer and another 800 in the truck bed. Started out with horrible gas mileage (from 5-8 depending on speed.) The truck turned 3000 miles and a signal light to see dealer for exhaust service comes on. I clear it, and re-fuel. The next tank I get a consistent 12 miles per gallon and that continues for the rest of the trip through the Montana Rockies and Cascades (now have ~4000 miles.) Also getting much better around town without the trailer of 19 mpg (used to be more like 12-13.)

Is this caused by a programming change that hits at 3k?
Is it just better because I left the sub zero temps on Minnesota (less rolling resistance in the joints, tranny etc.. with warmer temps?)
The service exhaust code has never come up again either?
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Old 03-17-2014, 09:52 PM
gsalgado's Avatar
gsalgado gsalgado is offline
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Join Date: Feb 2014
Location: Tampa
Age: 35
Posts: 106
Gender: Male
Vehicle: 2014 Ram 1500
Trim Level: Tradesman
Color: Western Brown Pearl
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
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Strange, make sure you are manually calculating your MPG.
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3000 mile, computer, cummins, mileage

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