App to suggest slower max speed if this would make the overall journey quicker.

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I’ve noticed on a lot of long distance drives I do, I can get to my destination faster by travelling at say 60mph rather than 70mph. This is due to improved efficiency resulting in less charging time or not needing to charge at all.

I’d like the app to calculate this at the start of each journey and advise if driving at a slower speed would reduce journey time