Enclosed vs Utility Trailer

[Turkeygetpwnd38]

I just pulled a 6x10 enclosed from Tampa to Flagstaff, 2500 diesel. My MPG went from 18/20mpg to 10-12mpg. The enclosed makes a huge difference compared to utility, especially with wind.

Thought I'd follow up since I just did about the same drive with a 5x10 utility trailer with same weight load.
Ram 2500 diesel- 20mpg
5x10 utility- 16mpg
6x10 enclosed- 10-12mpg
28ft travel trailer (7k+ lbs)- 8mpg

Paints a pretty good picture. For the diesel anyway, wind resistance seems to be the biggest contributor.