It's not a benchmark, but there is a youtube channel (Out of Spec) which tests these systems, and I think they also say Mercedes are the best in their "Hogback

It's not a benchmark, but there is a youtube channel (Out of Spec) which tests these systems, and I think they also say Mercedes are the best in their "Hogback challenge". https://www.youtube.com/watch?v=xK3NcHSH49Q&list=PLVa4b_Vn4gbBRwZoFf2rrenzUwsKU0jZk https://www.youtube.com/watch?v=xK3NcHSH49Q&list=PLVa4b_Vn4g... Worth checking out, many cars are very bad.