I had to look closely -- but ya, there's a van in there :P
It seems like common sense....
The investigators concluded that rounding the vertical corners front and rear reduced drag by 40 percent, yet decreased the vehicle's internal volume by only 1.3 percent. Rounding both the vertical and horizontal corners cut drag by 54 percent, resulting in a three percent loss of internal volume.
But quite a few new cars are coming off the line with straight edges, sharp corners etc. - more prevalent on cars that were designed to look like it has muscles
Just passing a link along :P
Time is the best teacher. Unfortunately it kills all its students.