wreckdiver1321
Overlander
The mileage increase is probably because of the same streamlining tonneau covers and camper shells add. Good to hear, and hope it works.
That's sort of what I'm thinking.
Not weird at all, many people have done it with similar results as you. In fact, on our last trip the owner of the Tacoma with a RTT told me that he lowered his to match the roofline and now there's less wind drag, much better MPGs as a result and probably better aerodynamics than with an empty bed.
Yeah, I expected it to make a positive difference, I just didn't expect it to make that large a difference. I'm very impressed with the change. Having the tent on the tall rack vs the short rack is a 4-5 mpg difference.
On that note, I got the third Yakima crossbar setup installed. Seems much more stable, although still a bit bouncy going down the road. That being said, the bed on my truck seems more "jiggly" than I'm used to, so I'm sure most of it is that.