Alright, good info. If the fuel saver isn't going to activate whether tow/haul is on or off, then why not just use it. I was figuring if the tow/haul mode was going to be overkill, then why not save a bit of gas on the trip with and not override the MDS unnecessarily.
As far as dealer mechanics go, I am wary about their advice at times. Too often, they will just recite what their supposed to say to customers. Or, because they have to be knowledgeable of so many cars, they can't have intimate or detailed info on any. I like these types of forums, usually the actual owners will have the highly detailed, empirical knowledge that dealer mechanics often lack.