Powerboost: what does the green band on the speedometer mean?

[RyanStroeder]

I think it has something to do with the battery charging or discharging, but I can't make sense of it. As soon as I get above 65 miles an hour it is always pointing below my current speed. Anyone can help me understand?

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[GolfR]

It’s the “Eco coach”, in order to maximize mpg you should try to keep your speed breaking and acceleration within the green band.