Another happy 6.4 owner here with the 3.73. The truck is a pleasure to drive and I've been very impressed with the quality of the ride. I know that is subjective and probably not that helpful, but still. I get about 13 MPG around town on hilly routes, but struggle to keep my foot out of it which works against me hehe. I got 17 MPG loaded down with camping gear/firewood and pulling a pop-up up and over the Cumberland Plateau which I thought was pretty good (MDS on about 20% of the time). I would buy the same truck again in a heartbeat. For me the 8 grand more for the diesel wasn't worth it at all.
