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I. - 4. Transition of Energy Consumption in the Transportation Sector
Transition of Freight Volumes by Freight Vehicles
  • The factors affecting energy consumption for freight vehicles include freight volume and energy intensity (energy consumption per unit of production output) factors.
  • Freight volume has been increasing slightly since 1990. In particular, freight for business has been increasing its share recently (87% of total freight in FY 2005).
    • Transition of Freight Volumes by Freight Vehicles
      * Private freight vehicle: Freight vehicles owned by private companies for product transportation
    Business freight vehicle: Freight vehicles owned by carriers for transport business
    Source: Annual Report on the Motor Vehicle Transport
    I. - 4. Transition of Energy Consumption in the Transportation Sector
    Transition of Energy Intensity of Freight Vehicles
  • The energy intensity (energy consumption per unit of production output) of business freight vehicles has been improving since FY 1990 (FY 2005: improved from FY 1990 by 12%), leading to the improvement of energy intensity of overall freight vehicles (FY 2005: improved from FY 1990 by 21%).
  • One of the contributing factors for the improvement is an increase in the size of freight vehicles.
  • Load ratio and operation ratio are improving in recent years.
    		•
    Transition of Energy Intensity of Freight Vehicles
      Source: Annual Report on the Motor Vehicle Transport
    I. - 4. Transition of Energy Consumption in the Transportation Sector
    Transition of Fuel Economy of Passenger Vehicles
    (Domestic Vehicles)
  • "Actual fuel economy per vehicle" is determined by "theoretical fuel economy" and "driving conditions".
  • Theoretical fuel economy has been improving since the mid-1990s
    (FY 2004: improved 2%, including improvement in new vehicles (21%), both from FY 1990).
  • Actual fuel economy has also been improving since the late 1990s, but not so much as theoretical fuel economy due to worsening driving conditions.
    • Contributing Factors that Increase Energy Consumption in the Transportation Sector
    Theoretical fuel economy (new vehicles): Theoretical fuel economy of vehicles being sold as brand new cars
    Theoretical fuel economy (stock vehicles): Theoretical fuel economy of vehicles in use
    Actual fuel economy (stock vehicles): Fuel economy calculated from actual driving distances, etc. of vehicles in use     		Source: Compiled based on data of the Japan Automobile Manufacturers Association, Inc.
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