2003 Dodge Cummins MPG - Diesel Bombers

5.9 Liter CR Dodge Cummins 03-07 Discussion of 5.9 Liter Dodge Cummins Diesels with Common Rail Injection

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Old 11-12-2011, 06:02 PM
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Default 2003 Dodge Cummins MPG

I have owned several modified ford diesel trucks but this dodge cummins i have now is my work truck & stock besides the air cleaner.
What is the best combination to get the most MPG?
I drive 200 miles a day without a trailer.
2003 Dodge 2500, crew cab, long box, 5.9 with automatic, & 305,000 miles.
With this high of miles im afraid to add HP but would like better than 18 MPG.
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Old 11-12-2011, 06:54 PM
Red_Rattler's Avatar
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Location: Columbus WI
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mines a manual 4x4 with 35's and a lift and can easily get 18 with my steup. Best Ive gotten was 23.8 this summer going south on a road trip.

But open up the exhaust better intake and my truck is always on lvl 6 on my Smarty
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Old 11-12-2011, 11:21 PM
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O, Yes i forgot to saw the exaust was cut off between the cab & box.
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Old 11-13-2011, 12:17 AM
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Location: Everett, WA
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im a solid 19-23. with the manual. how much weight are you hauling around? you might be able to gain something there.
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Old 11-20-2011, 05:32 PM
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How fast do you drive? How much town? How Meany stop lights? How much do you idle? There is a lot of how you drive! I get 19-20-21 it is jest how hard I push it. In town from 18 to 15 and that is how Meany stop and go. I live in a town that has 8 stop light I try to miss then all I can 18 in my home town.

Last edited by AABEAR; 11-20-2011 at 05:35 PM.
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Old 12-14-2011, 08:06 PM
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Best I ever got was 25. Not typical and I was coasting and driving like a old man. Normal is 18-19.
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Old 12-15-2011, 01:15 AM
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Location: Reno, Nevada
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check valve lash, keep rpm below 2100, don't use cruise control, avoid erratic acceleration. oh yeah-work it occasionally, or you'll ruin it. happy motoring!
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