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With your filter being black i would say that it has been awhile since it has been changed. At the appropriate interval I have a light brown filter, but a filter that has 20000+ mi. will have a black filter because of dirty fuel layering on the filter, but if it was changed at the right time, might have picked up some dirty fuel like whats at the bottom of the tank at the gas station. Hope this helps
2006 Dodge 2500 with Cummins (of course!), Quad LB, SMARTY (the best accessory to these trucks), Aeroturbine Muffler w/ 4 to 6" tip, MIA is the silencer ring, 2.5" levelers 18x9 Eagle Alloys 197 w/ 35/12.50/18 Mud Grapplers
Onl608 I would say your mileage drop would be more attributed to climate. I'm in MN and in winter, there is no such thing as mileage. Probably due to the winter fuel blend and it takes a long time to heat up the engine and drivetrain in these beasts.
If you feel as though your fuel filters are plugging prematurely try buying fuel from different outlets if possible. Find ones that cycle a lot of fuel. Some stations pump so little diesel that the stuff in the storage tanks is reverting back to crude....
"Q: What are asphaltenes?
A: Asphaltenes are tarry, organic particles that naturally occur in #2 diesel fuels. Asphaltene particles are generally thought to be in the one-half to 2 micron range and are harmless to the injection system, as they are soft and deformable. Concentrations of asphaltenes in diesel fuel vary widely and can increase through heat and fuel oxidation. As these tiny particles pass through the filter media they tend to stick to individual fibers. A build up of asphaltenes is the normal mechanism that plugs diesel fuel filters, not hard particles.
Reference FMC TSB-95-1R1"
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