We thought we knew our way around Preuilly and its environs - we have owned this house for 14 years, and lived here for over 11 years. However, our new car would seem to think we have much to learn.
One of the setting on its GPS system is "eco". I am not sure what criteria it applies to "eco", but as far as we can work out it involves finding roads no-one has driven down in 50 years, and trying to join them all up. We use it quite a lot when we have time to spare, because it takes us places we have never been, along roads we didnt even suspect existed.
Take the route from Blois, for instance. We have been to Blois many times and have always known we have a choice of three or four routes. Now we can make that five routes. (link here)
It's not the shortest route, nor the fastest. It doesn't even avoid hills to save us fuel, and it seems to take us through a lot of hamlets and villages that have 30km/h speed limits and hairpin bends. It is, however, interesting.
Google Maps' time calculation is extremely ambitious - just allow yourself plenty of time...