Bobby,
It looks like the turn angle chart in the R&T article was simply a static comparison of the showroom stock cars they tested in their drift article. They turned the wheels as far as they would go and measured the inside and outside turn angles. They commented that big turn angles are important for drifting and, without explanation, they commented on the big difference in toe out between the Corvette and the BMW. It wasn't a very scientific or deliberate Ackermann comparison. I measured the Ackermann on my C6 Z06 a while back and it was virtually zero at 20 degrees turn angle -- not much different than the Grand Sport in the article.
Pappy
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