It would be interesting to see the details of the test, like how fast and were the trucks modified? It could be that since our trucks are much higher off the ground and have more air passing under them it is altering the effects. Maybe we are seeing a lot of drag behind the tail gate as opposed to infront, that is eliminated when the tail gate is down.

Frank.

1994 4runner, 3.0, auto, 4.88's, 31's, BJ spacers, Coil spacers, air shocks, D-ring anchors, 4Crawler F/R swaybar discos.
www.sdori.com