@Nick-Carthew & @Con-Hennekens Thank you for your reaction
Good tip to calculate --% extra.
But, when I make a route of 3 to 4 weeks traveling every day, I prefer the software calculate for me.
Every country in Europe has its own speed limit, in France the speed is 130 km/hr. The profit when you can use a camper preset, the software / navigation will select automaticly a route thats shorter or quicker than the “curve” of the highway (mostly payed).
A camper preset is really ideal, just like the current preset of the bike or walking.
Greetings,
Saskia.