Minnesota Republicans are urging Governor Tim Walz to allow red-dyed diesel fuel on state highways, arguing it could help lower fuel costs for farmers, truckers and other drivers during harvest season.

In a letter to Walz, Congresswoman Michelle Fischbach and other Republicans say the savings could reach about 60 dollars per fill-up. Red-dyed diesel is normally reserved for off-road equipment and is exempt from highway fuel taxes.

Walz has declined to follow the federal authorization, while the state says federal action does not override Minnesota’s fuel-tax laws. State officials have also noted that changes to those taxes would require legislative action.

Critics of expanding red-dyed diesel use say the savings may be limited and could reduce revenue for road and bridge maintenance, which relies on fuel taxes. The federal policy also does not address the underlying diesel supply shortages driving prices higher.

Both sides say lowering fuel costs is important, but they disagree over whether expanding red-dyed diesel use is the best way to provide relief.