By David Shepardson WASHINGTON (Reuters) -President Joe Biden’s administration on Friday sharply boosted fuel economy standards for vehicles, reversing former President Donald Trump’s rollback of U.S. regulations aimed at improving gas mileage and cutting tailpipe pollution. The National Highway Traffic Safety Administration (NHTSA) announced it will boost fuel efficiency requirements by 8% for both the 2024 and 2025 model years and 10% in 2026. That was a slightly bigger increase than the proposal outlined in August. The NHTSA rules are about the same as rules previously announced by the Envi…