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Old 04-01-2013, 08:57 PM
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Desert Rat Desert Rat is offline
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Default Sudden mileage drop with diesel

2007 5.9 4x4 2500. I usually average 15-16MPG with mixed driving. Last tank was just over 11. I can think of some not optimal conditions on this last tank, but nothing to justify a drop like that.

Truck throttle response hasn't seemed to change, no check engine lights, and no black smoke.....Just garbage fuel economy.

Fire Congress....all of 'em.
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Old 04-02-2013, 03:06 PM
05hemi1500 05hemi1500 is offline
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Check your intake make sure the filter is clean and all components are tight no air leaks. Then plug into a computer and check your ECMs fuel system readings see if you have a possible problem with and injector or a possible partial blocked fuel line
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