Automaker trade backs U.S. on effort to weaken fuel efficiency rules

WASHINGTON (Reuters) - A group representing many major automakers on Friday backed the Trump administration's decision to weaken Obama administration fuel efficiency standards but said it opposed further reductions in requirements.In March, the Trump administration issued final rules requiring 1.5% annual increases in efficiency through 2026 - far weaker than the 5% increases in the discarded Obama-era rules - but abandoned its August 2018 proposal to freeze requirements at 2020 levels through..