Fuel Economy Standards on Heavy Duty Vehicles

Last updated: 11 February 2022

Diesel trucks with a gross vehicle weight (GVW) >= 3.5 t, all diesel tractor trucks, diesel transit buses with GVW >= 6 t and diesel highway buses with GVW >= 3.5t.


Japanese regulators tightened Phase 1 standards by raising the fuel economy targets. When the Phase 2 targets are fully met, the fleet average fuel economy is estimated to be:

  • For trucks, 7.63 km/L, a 13.4% improvement over the 2015 baseline at 6.72 km/L
  • For buses, 6.52 km/L, a 14.3% improvement over the 2015 baseline at 5.71 km/L

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