So I came across another factory trailer that looked promising until I looked at some owners forums. Seems like this teardrop design is actually worse then just pulling a box! Many v6 owners can hardly break 10 mpg at what would seem a reasonable 55mph. About the best anyone seems to get regardless of the tow vehicle is 14 mpg.
It seems after a few years of making this the company added a small spoiler above the back window that does seem to help 1-2 mpg. I'm sure that rooftop ac doesn't help either, they should use a wall mount.
I actually feel sorry for the owners who bought this thinking it would do fairly well, I know before I found this forum I would have thought the same.
So is it actually worse then a square back? Could it be fixed with a bigger spoiler?