The government has compiled fuel economy regulations for new vehicles obliging automakers to improve fuel efficiency by 30 percent on average by fiscal 2030 from fiscal 2016 levels.
The government is also aiming to raise the proportion of all-electric vehicles and plug-in hybrid vehicles to 20 to 30 percent of new vehicle sales in 2030.
The transport and industry ministries jointly submitted the new regulations Monday to a meeting of a related advisory council.
The regulations set an average fuel efficiency target of 25.4 kilometers per liter of gasoline for fiscal 2030, an improvement of some 32 percent from the average of 19.2 kilometers in fiscal 2016.
The ministries plan to revise relevant ordinances this fiscal year, which ends next March 31.
The new regulations are set to cover electric vehicles and plug-in hybrids, on top of gasoline vehicles.
Makers of electric vehicles will be urged to improve mileage per charge.
According to the Ministry of Economy, Trade and Industry, electric vehicles and plug-in hybrids together accounted for only about 1 percent of all new vehicles sold in Japan in 2017.