US President Donald Trump said on Friday that his administration will  finalize its rollback of Obama-era vehicle emissions standards next year  and expected it would provoke a new legal challenge by California.
The administration had signaled in recent months it could finalize  its proposed revisions to the requirements before the end of 2019. The  administration has argued that the rollbacks are necessary for economic  and safety reasons but California and environmentalists reject that  analysis, saying consumers would spend hundreds of billions more in fuel  costs.
In August 2018, the administration proposed freezing  vehicle efficiency requirements at 2020 levels through 2026, which would  result in average fuel efficiency of 37 miles per gallon (mpg) by 2026,  compared with 46.7 mpg under rules adopted in 2012. The Trump  administration’s “preferred option” would hike U.S. oil consumption by  about 500,000 barrels per day by the 2030s but reduce automakers  regulatory costs by more than $300 billion...  
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