On Tuesday, the efforts to cut back oil consumption and greenhouse-gas emissions in the US finally witnessed a notable advance when Obama administration released new fuel-economy standards, under which the automakers will be required to bring about an almost two-fold improvement in the average fuel economy of new cars and trucks by 2025.

The final version of the new rules issued by Obama administration underscores that, by the year 2025, the average mileage of cars and light trucks will be increased by nearly two times --- to 54.5 miles per gallon (mpg) by 2025 from 28.6 mpg at the end of 2011.

With the administration already having tightened fuel-economy requirements for the new vehicles manufactured between 2012 and 2016, the new standards will further require that the fuel efficiency of the new cars built during the 2017-2025 is increased steadily.

As a result of the new fuel-economy standards finalized by the administration, automakers will be increasingly pressurized not only to boost the development of electrified vehicles, but also to bring about noteworthy improvements in the mileage of their mass-market models, with the help of techniques like lighter car weights and more fuel-efficient engines.

Meanwhile, noting that the new fuel-economy standards bring the US in line with countries around the world, Tony Hemet - director of the Scripps Institution of Oceanography – said during a Tuesday event: "The mileage standards are modest compared to the rest of the world. Europe and China already meet these standards."