I drive the DFW area of Texas and F150s abound. I look and pay attention and I've seen one and it had dealer tags making it a demo or loaner. I'm thinking not many are stepping up to pay thousands more for the diesel one when gasoline today is $1.71 and diesel fuel $2.74. A neighbor sells at a CDRJ dealer and he says Ram 1500 with diesel has slowed to a slug pace before they went out of production (no '19 body style 1500 with Ecodiesel yet).