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: Plugged CAT = Mileage Drop?? street3285 06-27-2009, 10:03 PM My dad has a 04.5 LLY and has recently notice a drop in mileage. I think he said about 1, maybe 2 MPG. His truck has 95K miles. Is it possible for the CAT (DOC) to get plugged up? Can this be causing this recent drop in mileage? CRASHNBURN 06-27-2009, 10:17 PM My dad has a 04.5 LLY and has recently notice a drop in mileage. I think he said about 1, maybe 2 MPG. His truck has 95K miles. Is it possible for the CAT (DOC) to get plugged up? Can this be causing this recent drop in mileage? Check the air & fuel filters also... street3285 06-27-2009, 10:35 PM I will have him check that, but I know he keeps up regularly on that stuff. He has been running the Quadzilla for about 10K. dozerboy 06-28-2009, 08:15 PM I would think he would be getting codes if that was the case. | ||