Just my 2 cents -- I gained 2 MPG by taking the tailgate OFF.
In article <7639-4358EE66firstname.lastname@example.org>, email@example.com
>according to this site the most efficient
> way to travel is with the tail gate up.
A camper addition adds weight, so that will affect fuel consumption as
will the profile of the unit.....kind of a no-brainer. As to that
'test'; lol, I'm positive they meant well, but.....
Tailgate up/down/off? Here in Texas, I've been told it is against the
law to tool around with the thing down, probably the same in other
states as well. Common sense should tell us that the tailgate in the
up/closed position, and an open bed, will have air slamming against it.
But the effect on fuel mileage is infinitesimal...IMO anyway. Take it
off altogether....smooth airflow in that configuration!