Devices and methods for determining fuel consumption and searching vehicle routes

摘要: A route searching device according to an embodiment of the invention includes estimated fuel consumption amount computing unit that computes each interval constituting plural routes from a departure point destination and optimum selecting selects in which total is minimized. The may be obtained by adding cruise amount, gradient vehicle-speed fluctuation amount. In further aspect, average value for speed range determined based on limited data, values updated using measured probe data.