400isx poor fuel milage

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01-25-2008, 03:58 AM

ripp_jr

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Join Date: Jul 2007

Posts: 58

400isx poor fuel milage

truck getting poor fuel milage new engine and turbo doesnt have but about 10000 miles on it any suggestions

01-25-2008, 05:24 AM

BanditsCousin

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Location: Chicago, IL

Posts: 3,800

What is bad fuel mileage>?

Anyway, it still may need to be broken in. I get 5.5 out of my 500 ISX in a T600 pulling HHG. Numbers would elp me to see how "bad" you're doing.

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01-26-2008, 05:08 PM

tracer

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Join Date: Mar 2007

Location: Cambridge, Ontario, Canada

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You can do a Dyno at Cummins. They can tune your fuel settings and horse power. I just did this and the truck pulls much better plus I have a feeling the fuel mileage has improved too.

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