<p>A group of 23 U.S. states led by California, the District of Columbia and some major cities are challenging a Trump administration decision to weaken Obama administration fuel efficiency standards.</p>.<p>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 2026.</p>.<p>Last week, a trade group representing General Motors Co , Fiat Chrysler Automobiles, Toyota Motor Corp and others sided with the Trump administration on its plan and opposed a legal challenge to further weaken the requirements. Other automakers including Ford Motor Co are not backing the administration plan.</p>.<p>California Attorney General Xavier Becerra said the revised requirements "will increase costs to consumers and allow the emission of dangerous pollutants that directly threaten the health of our communities." </p>
<p>A group of 23 U.S. states led by California, the District of Columbia and some major cities are challenging a Trump administration decision to weaken Obama administration fuel efficiency standards.</p>.<p>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 2026.</p>.<p>Last week, a trade group representing General Motors Co , Fiat Chrysler Automobiles, Toyota Motor Corp and others sided with the Trump administration on its plan and opposed a legal challenge to further weaken the requirements. Other automakers including Ford Motor Co are not backing the administration plan.</p>.<p>California Attorney General Xavier Becerra said the revised requirements "will increase costs to consumers and allow the emission of dangerous pollutants that directly threaten the health of our communities." </p>