[caffiend]

Yeah, but some sophisticated sat navs can direct you on gentle (longer) inclines to steeper declines. Obviously that wouldn't make much sense if it meant you ended up driving many more kms to get there, but they can be pretty clever with their routing.

Our company does routing optimisation, and we can even get delivery trucks going up gentler inclines when they are fully laden to save diesel, while still keeping the route as short as possible.