The purpose of this report is to support Vägverket Intelligenta Transportsystem Nationella Tjänster, Samhälle in its efforts to improve the environmental characteristics of automotive transportation. The report focuses on three principal areas: - Pre-conditions for developing a commercially available navigation system that identifies fuel-efficient routes for automobiles and trucks. - The European navigation market with respect to fuel efficiency, with specific focus on heavy goods vehicles and busses. - The potential role of Vägverket in both supporting and stimulating the market for fuel efficient navigation.