D4 locks out O/D. When you live in the mountains like I do, use D4 so the trans is not hunting for top gear when going up hill. Use D4 for long down hill engine braking so as not riding brake. Use D4 in town for bumper to bumper traffic again so trans is not hunting for top gear. In the winter I use D4 for engine braking on very slick driving in town for the engine braking so as not to use brake. The owners manual talks about some of this.
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