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Regen from high to low is Sport, Comfort and then ECO Pro, and as @corduroy said ECO Pro is for maximizing efficiency and allow you to coast longest distance. It's best used on a highway I believe, and if you are constantly going up/down hill, I'd think Comfort or even Sport will give you best energy regen. Plus it makes the car more fun to drive... I can imagine driving in ECO Pro mode in the hills...
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2017 X5 40e Carbon Black M Sport
2018 430i Gran Coupe Alpine White M Sport
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