I was going through Illinios today on my way to Mt vernon. About ten miles east of town on 64 a Dodge, looked like a 99 or so with dual stacks was merging on so I got over to let him on. I was far enough back I don't think he saw the stacks. He started rollin coal on me when he got on the highway. I went on by trying not to get off cruise and burn even more $4 fuel. He decided to get behind me in the left lane, at first I kept it on the low, he would speed up and slow down. Finally I laid the WOOD and smoked him almost completely out of sight of the rear view. When I looked down I was going 100+ not a good idea in Illinois. When the smoke cleared he was way, way back there. I am glad he did't have too much in it!