[phoebeisis]

"someday" I will add a boatail to my large SUV. We could use it for storage, and we already put a hitch carrier behind it, so it wouldn't really add too much to the overall length of a 217" vehicle. I'm guessing just 3- to 4 ft of tail might improve my 65 mph hy mpg by at least 1 mpg-

Crudely shaped large vehicles should benefit much more from aero stuff than most cars, and adding 3' to a 19' vehicle doesn't make too much difference in hy road trip traveling. Many of these monsters travel with hitch carriers, or much worse roof baskets, bike racks.

Charlie