Biofuel advocates last week applauded a recent federal court ruling that is expected to pressure the Environmental Protection Agency (EPA) to issue fewer small refinery waivers as it administers the Renewable Fuel Standard (RFS).

In its ruling, the U.S. Court of Appeals for the 10th Circuit in Denver sided with several biofuel groups that sued the EPA in 2018 over the agencies handling of the waivers. Farm and...