An interesting comment about increased economy despite adding 1,300 pounds in an aero trailer.
.
"The highest mpg I've recorded with my truck was when pulling my gap-filled, full-boat-tail trailer.I was 1,300 lbs heavier than stock and recorded 22% better mpg than the best ever recorded without it.(47.9 vs 39 mpg)"
.
http://ecomodder.com/forum/323828-post14.html
.