Okay....I found it.
http://www.pontiacserver.com/mtgto5.html
Now, my question is how are they getting this measurement?? Is this from the inside of the car or the the centerline of the car?
Today I went to a parking lot and did a little measuring..... I used the painted lines of the parking spots as a kind of "grid". I put the drivers side rear wheel on one of the the painted lines at the point where it intersects the long painted line that goes down the center and used that as my line to measure dia. I turned the wheel all the way to the left and made a complete 360 to make sure I came back to the same spot. Then I went 180 and stopped and marked my position. I then measured the distance between the two points (using the long painted line as a straight line). I came up with 35' (+/- a couple inches). Again, this is the turning dia. measured from the inside of the circle. I did the test a couple times just to make sure...
Soo..... if Motortrend is saying 40.9" Turning Dia. from what point are they making their measurement?