U.S. regulators to approve fix for more than 300,000 VW diesels: sources

WASHINGTON (Reuters) - The U.S. Environmental Protection Agency and California Air Resources Board will approve later on Thursday a fix for more than 300,000 older Volkswagen AG diesel cars, two people briefed on the matter said. The fix will include hardware and software upgrades, but will reduce vehicle fuel economy ratings by as much as 2 miles per gallon, said the persons, who could not speak for attribution because the decision was not yet public.