On Sun, 26 May 2013 07:47:23 -0400, Ed Pawlowski wrote:

On Sun, 26 May 2013 05:56:18 -0500, "HeyBub"
wrote:

Which is better for fuel economy?

GMC has the answer.

http://www.foxnews.com/leisure/2013/05/20/tailgate-up-or-down-gmc-solves-age-old-pickup-truck-mystery/?intcmp=features


Sounds like it is publicity for GM. This was tested and proven a
couple of times over the years. While you are looking, the windows
down versus up and using the AC is pretty much a wash too.

From what I"ve read, once you are over about 45 mph it's not a wash
but you are better off with the windows up and using the AC. So it's
going to depend on the driving profile.