Regulators will likely finalize 0.5 percent annual stringency increases in fuel economy and carbon dioxide emissions standards for autos, Sen. Tom Carper (D-Del.) said at the Jan. 16 hearing on the nomination of Andrew Wheeler as EPA administrator.

That increase would be “10 times weaker” than current standards through 2025, enacted during the Obama administration, Carper said. He said the plan would result in litigation and uncertainty for automakers.

Industry is urging the Trump administration to steer away from its...