It would seem that your experience with light trucks, as a supplier, and mine, as an end user, differ. Not at all uncommon. We have never owned a Dodge V10 truck that produced 18 mpg, not even empty. That's not to question your honesty, or your observation. It only serves to state my experience as a fleet operator. You should also know that at no time did I question your knowledge, experience, or opinion. My comment about your truck being a "Keeper" was not meant as a wise crack. If I could get 18 mpg out of a V10 Dodge, I'd be extremely happy. If you're getting that, good for you.
My association with any other members, or chat board not withstanding. Those associations have nothing, whatsoever, to do with my experience, opinions, observations, or integrity.
I do not disagree with the V-10'a ability to pull, and I agree, whole heartedly that the diesel is the way to go.
This discussion was based on the decision to buy a new truck or engine, or modify what the writer already has. I'm not intimating that the 318 will do the towing job as easily as a V-10, or Diesel. What I said was a "Purpose built" 318, properly geared, would allow him to tow occasionally, and at speed, and still give him good economy and performance in day to day (trailorless) driving. Further, since he already owns the 318, building it to suit the task is less costly than replacng it. The GV unit will help, but I don't believe it to be the complete answer in this case.
Thanks.