strange calculation in navigation

In my Prius+ I have the original Toyota navigation. In my last trip from France home (Netherlands) it gave some strange calculation in the available choices: Fast route: 863 km, 17:11 arrival time Ecologic route: 861 km, 17:09 arrival time

How can the ecologic route be faster then the fast route?

Reply to
Thibaud Taudin Chabot
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