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Ford, Honda, VW and BMW seal California fuel-economy and emissions deal .
The voluntary deal flies in the face of newly announced standards from the Trump administration. © Provided by Roadshow The four automakers will improve fuel economy by 3.7% year-over-year, rather than 1.5%. Irfan Khan/Getty Images The California Air Resources Board sealed a new deal with the four major automakers on the matter, Reuters reported Monday, after initially announcing their intentions this time last year. CARB did not immediately return Roadshow's request for comment on the deal's finalization.