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I don't understand what you want the transmission to do. On sport and sport + , it does downshift to keep you in the powerband. Secondly your comparing the engine braking while winding down the rpm band to an 18 wheeler, are you serious 18 wheeler have tall gear for pulling cargo.
In our car or the 330i, you only feel that engine braking at 1st, 2nd, and 3rd, not that you would downshift to 1st.
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