Good day to all. I was inquirying about a larger tank gor my 08 f350 crew cab at a shop who specializes in diesel repair. He had metioned to me about a protoyype unit that he had installed on his 08 which gave him better fuel economy. Its a cowel unduction unit place on the side of the truck that allows the engine to burn cooler this limiting the regeneration mode to activate. Has anyone else heard of this? I will keep you posted. They said its going into production and the results were fantastic.