Join Date: Sep 1999
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I have an 05 Ram 3500 diesel (5.9L) 4x4, NV5600 6 speed, and 3.73 gears. Best I've managed has been about 21 on the highway unloaded travelling about 75 or so. I imagine if I could hold the speed down to about 65 or so on the expressway it might be possible to eek out 23-24, but I unwilling to drive that slow. I can't tell you city because I don't do enough dedicated city driving to know for sure. Country/back roads with a little city driving I tend to average about 18-20, depending on how fast I feel like accelerating and all that.
Best I've managed to get towing was roughly 16mpg towing my ~4000lbs worth of boat, on the mostly flat roads, with a handful of decent hills thrown in. Usually less than that when I'm being a little harder on the throttle. I am not a bit fan of putting around if I don't have to be, so usually I don't and the MPG suffers a little.
I think if they're talking about that sort of mileage with any trailers of any real serious substance, they're just blowing smoke into your nether-region...