Ram towing mileage

Bobzilla said
What mileage do you get with no trailer? What speeds with and without trailer. What axle ratio? What size tire? Any engine or exhaust modifications?

I have an 08 Ram 1500, 5.7L, 4x4, 3.55 (or3.54?) axle ratio, stock 20 inch wheel and tire size. Mine is averaging 16.5 mpg with assorted driving and freeway speeds with NO load. if I drive 55-60 mph for long drives it has been up to 19 mpg. My current mileage is noticeable low but I know it needs a new oxygen sensor and is due for spark plugs.
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We're pretty similar then. My combined city/highway driving at various speeds and unloaded averages about 16 mpg. I do have the 20" wheels, 2wd, and I am unsure of my rear gear ratio. The best mine has ever done on long drives unloaded is 19 mpg. I am also due for spark plugs, but I know that want help a bunch.