1998 Series 60 Poor Fuel Economy
I have a 98' FL Century running at 1.1 M on the original rebuild. I did a head gasket at about 800 K, and put in 3 injectors at about the same time. The thing runs like a swiss watch. The problem is that it's getting very poor fuel economy. It has been getting about 4 MPG over the past month. Before that, it was with a different owner, so I don't know what it was doing. I replaced the oil pan gasket and checked the cylinders for wear, and they were very smooth. Any ideas what I should look into? Old DDEC III isn't throwing any codes. Fuel is clean, and so are the air and fuel filters. The trailer doesn't even have any smoke stain on it whatsoever. She's burning clean.